suppose there is a lottery where the organizers pick a set of 11 distinct numbers. a player then picks 7 distinct numbers and wins when all 7 are in the set chosen by the organizers. numbers chosen by both the players and organizers come from the set {1, 2, ..., 80}. (a) let the sample space, s, be all the sets of 7 numbers the player can choose. what is |s|? (b) let e be the event that all the numbers the player chooses are in the winning set. what is |e|? (c) what is the probability of winning? as a reminder, you may leave your answer un- simplified.

Answer:

The correct answer is option B: 2x^2 + 11x + 12 cubic inches

Step-by-step explanation:

The volume of a rectangular prism is given by the formula V = lwh, where l is the length, w is the width (or base), and h is the height of the prism.

Given that the area of the base is (x + 4) square inches and the height is (2x + 3) inches, we can substitute these values into the formula to find the volume:

V = (x + 4)(2x + 3)

Now, we can multiply the binomials using the distributive property:

V = 2x^2 + 3x + 8x + 12

V = 2x^2 + 11x + 12

So, the correct answer is option B: 2x^2 + 11x + 12 cubic inches.

If k is the prime number, then the expression 20k is divisible by 2, 5, and k.

If k = 7, then the expression 20k is divisible by 2, 5, and 7.

Given that:

Expression, 20k

The factor of the expression 20k is given as,

20k = 2 x 2 x 5 x k

20k = 2² x 5 x k

If k is the prime number, then the expression 20k is divisible by 2, 5, and k.

If k = 7, then the expression 20k is divisible by 2, 5, and 7.

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Answer:

  see attached

Step-by-step explanation:

You want a graph of the line y = -3x +2.

The infinite number of points that satisfy the equation y = -3x +2 will form a line on the coordinate plane. It will cross the y-axis at y = 2, and will have a slope (rise/run) of -3 units for each unit to the right. The attachment shows the graph.

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The probability that no more than 6 women dislike their mother-in-law is very low, at 0.00002

We can model the number of women who dislike their mother-in-law out of a sample of 9 married women using a binomial distribution with parameters n=9 and p=0.85.

(a)   [tex]P(all 9 women dislike their mother-in-law) = (0.85)^9 = 0.322[/tex]

(b) [tex]P(none of the 9 women dislike their mother-in-law) = (1-0.85)^9 = 0.0001[/tex]

(c) P(at least one woman dislikes her mother-in-law) = 1 - P(none of the 9 women dislike their mother-in-law) = 1 - 0.0001 = 0.9999

(d) P(no more than 6 women dislike their mother-in-law) = P(X <= 6) where X follows a binomial distribution with parameters n=9 and p=0.85. We can use a calculator or binomial distribution table to find:

P(X <= 6) = 0.00002

Therefore, the probability that no more than 6 women dislike their mother-in-law is very low, at 0.00002.

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The system of equations using the backslash operator \, which performs Gaussian elimination with partial pivoting to obtain the solution x. Finally, we display the values of x, y, and z using the disp function.

Here's a MATLAB program that solves the given system of equations using the provided values of R1, R2, and R3 from the file quiz2.mat:

% Load the data from quiz2.mat

load('quiz2.mat');

% Define the coefficient matrix and the right-hand side vector

A = [2 1 -1; -3 -1 2; -2 1 2];

b = [R1; R2; R3];

% Solve the system of equations using the backslash operator

x = A \ b;

% Display the solution

disp(['x = ' num2str(x(1))]);

disp(['y = ' num2str(x(2))]);

disp(['z = ' num2str(x(3))]);

In this program, we first load the values of R1, R2, and R3 from the file quiz2.mat using the load function. We then define the coefficient matrix A and the right-hand side vector b using the given system of equations.

We solve the system of equations using the backslash operator \, which performs Gaussian elimination with partial pivoting to obtain the solution x. Finally, we display the values of x, y, and z using the disp function.

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The child will always have the recessive trait in their phenotype.

If both parents are homozygous for a recessive trait, it means they both carry two copies of the recessive allele. Let's assume that the dominant allele is represented by 'A' and the recessive allele by 'a'. Since both parents are homozygous for the recessive trait, their genotype must be 'aa'.

When these parents have children, they will each contribute one 'a' allele, resulting in all of their children inheriting the recessive allele. The probability that their child will have the trait is therefore 100%. The probability of not inheriting the trait is 0%.

Therefore, the answer to the question is 0%. The child will always have the recessive trait in their phenotype.

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Jim prepared a few pancakes. He used 9 cups of milk for every 5 cups of flour. Jim's pancakes have a flour-to-milk ratio of 5:9.

To see why, let's break down what this ratio means. The colon in the ratio notation indicates a comparison between two quantities, in this case, flour and milk. The first number before the colon (5) represents the amount of flour, while the second number after the colon (9) represents the amount of milk. So the ratio 5:9 tells us that for every 5 cups of flour Jim used, he added 9 cups of milk.

We can also express this ratio as a fraction, by dividing the amount of flour by the amount of milk. Using Jim's recipe, this would be:

5 cups of flour / 9 cups of milk

Simplifying this fraction by dividing both the numerator and denominator by 5 gives:

1 cup of flour / (9/5) cups of milk

Multiplying the denominator by 5/5 to get a common denominator gives:

1 cup of flour / 45/5 cups of milk

Simplifying again by dividing both the numerator and denominator by 5 gives:

1/9 cup of flour / 1 cup of milk

So we can see that the ratio of flour to milk in Jim's pancakes is indeed 5:9, or equivalently 1/9 cup of flour to 1 cup of milk.

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The reflected coordinates of the vertices A, B, and C are:

A' = (4, -4)
B' = (0, 0)
C' = (-2, -5)

To reflect a point across the line y = x, we swap its x and y coordinates. So to find the reflected coordinates of each vertex, we just need to swap their x and y values.

Let's start with vertex A(-4, 4):

After reflecting across y = x, its coordinates become (4, -4).

Now, let's move to vertex B(0,0):

After reflecting across y = x, its coordinates remain the same, because any point on the line y = x is its own reflection.

Finally, we have vertex C(-5, -2):

After reflecting across y = x, its coordinates become (-2, -5).

Therefore, the reflected coordinates of the vertices A, B, and C are:

A' = (4, -4)

B' = (0, 0)

C' = (-2, -5)

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The characteristic that is not true for a normal distribution is "the mean is always zero".

While it is true that the normal distribution is symmetrical, symmetric about its mean, and has a bell-shaped distribution, the mean of a normal distribution can be any number, not just zero. The mean of a normal distribution represents the center of the distribution and can be positive, negative, or zero, depending on the data being analyzed. It is important to note that a normal distribution is a statistical concept that is used to describe the distribution of a set of data, and it is often used in various fields such as finance, engineering, and science. The normal distribution is known for its properties such as the central limit theorem, which states that the sum of a large number of independent random variables will be approximately normally distributed. In conclusion, the normal distribution is a symmetrical, bell-shaped distribution that is centered around its mean, but the mean can be any number, not just zero.

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The solution to the partial differential equation is u(x,t) = [tex]kx^{a/10[/tex], where k is a constant.

A differential equation is a mathematical formula that includes one or more terms as well as the derivatives of one variable with respect to another.

To find the Laplace transform of f(t) = te^(-4t) cosh(5t), we use the formula:

[tex]L{f(t)} = \int_0 f(t) e^{(-st)} dt[/tex]

= ∫₀^∞ [tex]te^{(-4t)} cosh(5t) e^{(-st)} dt[/tex]

= ∫₀^∞ t cosh(5t) [tex]e^{(-(4+s)t)[/tex] dt

Using integration by parts with u = t and dv = cosh(5t) [tex]e^{(-(4+s)t)[/tex] dt, we get:

L{f(t)} = [-t/(4+s) cosh(5t) [tex]e^{(-(4+s)t)[/tex]]₀^∞ + ∫₀^∞ (1/(4+s)) cosh(5t) [tex]e^{(-(4+s)t)[/tex] dt

Simplifying the boundary term, we get:

L{f(t)} = (1/(4+s)) ∫₀^∞ cosh(5t) [tex]e^{(-(4+s)t)}[/tex] dt

= (1/(4+s)) ∫₀^∞ (1/2) [[tex]e^{(5t)[/tex] + [tex]e^{(-5t)[/tex]] [tex]e^{(-(4+s)t)[/tex] dt

= (1/2(4+s)) ∫₀^∞ [[tex]e^{((1-s)t)[/tex] + [tex]e^{(-(9+s)t)[/tex]] dt

Using the Laplace transform of [tex]e^{(at)[/tex], we get:

L{f(t)} = (1/2(4+s)) [(1/(s-1)) + (1/(s+9))]

= (1/2) [(1/(4+s-4)) + (1/(4+s+36))]

= (1/2) [(1/(s+1)) + (1/(s+40))]

To solve the partial differential equation au/ax = 10 au/at by variable separable method, we can write:

(1/u) du/dt = 10/a dx/dt

Integrating both sides with respect to t and x, we get:

ln|u| = 10ax + C₁

Taking the exponential of both sides, we get:

|u| = [tex]e^{(10ax+C_1)[/tex]

= [tex]e^{(10ax)[/tex] [tex]e^{(C_1)[/tex]

= [tex]ke^{(10ax)[/tex]  (where k is a constant)

Since u is positive, we can drop the absolute value and write:

[tex]u = ke^{(10ax)[/tex]

Taking the partial derivative of u with respect to x, we get:

au/ax = [tex]10ke^{(10ax)[/tex]

Substituting this into the given partial differential equation, we get:

[tex]10ke^{(10ax)[/tex] = 10 au/at

Dividing both sides by 10u, we get:

(1/u) du/dt = a/(10x)

Integrating both sides with respect to t and x, we get:

ln|u| = (a/10) ln|x| + C₂

Taking the exponential of both sides, we get:

|u| = [tex]e^{(a/10 ln|x|+C_2)[/tex]

= [tex]e^{(ln|x|^{a/10)[/tex] [tex]e^{(C_2)[/tex]

= [tex]kx^{a/10[/tex]  (where k is a constant)

Since u is positive, we can drop the absolute value and write:

[tex]u = kx^{a/10[/tex]

The solution to the partial differential equation is u(x,t) = [tex]kx^{a/10[/tex], where k is a constant.

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The 90% confidence interval for the proportion of all adults in the United States who own an e-reader is 0.32 ± 1.645 * √(0.32 * 0.68 / 1,005). This corresponds to option (B) in your list of choices.

The appropriate formula for calculating the confidence interval for a proportion is:

sample proportion ± z*standard error

where z is the z-score corresponding to the desired level of confidence (90% in this case) and the standard error is:

sqrt((sample proportion*(1-sample proportion))/sample size)

Plugging in the values given in the question, we get:

sample proportion = 0.32
sample size = 1005
z-score for 90% confidence = 1.645 (option B)
standard error = sqrt((0.32*(1-0.32))/1005) = 0.015

So the appropriate 90% confidence interval is:

0.32 ± 1.645(0.015)
= 0.32 ± 0.025
= (0.295, 0.345)

Therefore, the correct answer is option B: 0.32 +1.645,10.3270.68

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The volume of the cone is 180π cubic feet (or approximately 565.49 cubic feet if you evaluate π as 3.14159).

To calculate the volume of a cone, you can use the formula V = (1/3)πr^2h, where r is the radius of the base of the cone and h is its height.

Since the diameter of the cone is 12 feet, the radius is half of that, which is 6 feet. And the height is given as 15 feet.

Plugging these values into the formula of volume, we get:

V = (1/3)π[tex](6)^2[/tex](15)

V = (1/3)π(36)(15)

V = (1/3)(540π)

V = 180π

Thus, the answer is 180π.

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After 20 years, the value of the fox population will be 640.

The population of the fox after 20 years is calculated as follows;

The given function is;

y = 40 x 4ˣ

Where;

how many 10 years period make up 20 years?

x = 2

The value of the fox population is calculated as follows

y = 40 x 4²

y = 40 x 16

y = 640

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Is each point a solution to the given system of equations;

(-2, 3): Yes.

(2, 5): No.

(0, 2): Yes.

(1, 0): No.

In order to graph the solution for the given system of linear inequalities on a coordinate plane, we would use an online graphing calculator to plot the given system of linear inequalities and then check the point of intersection;

y > x + 1          .....equation 1.

y < -2x + 6         .....equation 2.

Based on the graph (see attachment), we can logically deduce that the solution to the given system of linear inequalities is the shaded region behind the dashed lines, and the point of intersection of the lines on the graph representing each, which is given by the ordered pairs (-2, 3) and (0, 2).

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Answer:

15.8

Step-by-step explanation:

mean is the average in math so 9 + 14 + 11 + 31 + 14 =79 then you have to count how many numbers there is and minus it from the total which there is 5 numbers so 79 divided by 5 = 15.8

The measure of center that would be best to use for this distribution is the median

If the distribution is generally symmetric, the mean is the appropriate measure of center to use. This is because the mean considers every value in the distribution and is affected equally by each value.

As a result, if the dot plot has a skewed distribution, the median is the best measure of center to employ, whereas the mean is the best measure of center to use if the distribution is nearly symmetric.

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The use of regression modeling in retail analytics can help businesses make data-driven decisions that ultimately lead to increased profits and growth.

Based on the information given, it seems that the large sports supplier is interested in predicting the annual revenue of a particular store based on various factors, such as population, promotion expenditure, and distance from the city center. This is a common approach in retail analytics, where regression models are often used to predict sales or revenue based on different variables.

By constructing a regression model, the sports supplier can gain valuable insights into which factors are most strongly associated with revenue, and how they can optimize their operations to increase sales. For example, they may find that stores located closer to the city center tend to have higher revenue, or that increased promotion expenditure leads to a greater increase in revenue in smaller towns.

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By using the Chinese Remainder Theorem separate the statement into two congruences we have x(p-1)(q−1)+1 (mod pq) for all x € Z.

Under the condition that the divisors are pairwise coprime (no two divisors share a common factor other than 1), the Chinese remainder theorem states that if one knows the remainders of the Euclidean division of an integer n by several integers, then one can uniquely determine the remainder of the division of n by the product of these integers.

It suffices to show pq divides x(x(p-1)(q-1) - 1) for all x e Z. We consider three cases. Consider gcd (x, pq). It has 3 possibilities.

Case 1: If gcd(x, pq) 1. Then applying using Euler's Theorem we have

= x(pq) = 1 (mod pq)

= x(p-1)(−1) = 1 (mod pq)

= x(p-1)(q-1)+1 (mod pq)

and so the result holds if gcd(x, pq) = 1. EX

Case 2: If gcd(x, pq) p. This means x = 0 (mod p). In this case we have

= 0 = x (mod p).

Since gcd(x, pq) = p therefore qx and = 1 (mod q) by Fermat's Little Theorem. This gives us that x(p-1)(q-1)+1 so we have x9-1 x(p−1)(q−1) = 1 (mod q) = x(p-1)(q-1)+1 = x (mod q).

We have shown that x(p-1)(q-1)+1 = x (mod p) and x(p-1)(q-1)+1 = x (mod q). Using the Chinese Remainder Theorem we get x(p-1)(q−1)+1 = x (mod pq).

Case 3: If gcd(x, pq) = q. This case is same as Case 2, with p being replaced by q.

Thus we have extinguished all cases and we have shown x(p-1)(q−1)+1 (mod pq) for all x € Z.

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Complete question:

Let р and q be distinct primes. Show that for all x € Z, we have the congruence x(p-1)(9–1)+1 x (mod pq). (Hint: Use the Chinese Remainder Theorem/Sun Ze's Theorem to separate the statement into two congruences.)

Answer:

x=4

Step-by-step explanation:

as it's an equilateral each side will equal the same so the 12x will be the same as 10x+8

12x=10x+8

2x=8

x=4

if u substitute x into each equation

12×4=48

10×4+8=48

they equal the same

so x=4

The probability of puling out

In order to calculate the probability of extracting each shape from the bag, a formula can be employed:

Probability = Number of times the shape was taken out / Total number of times shapes were taken out

Given below are the frequency of each shape:

Triangle: 3 times

Circle: 12 times

Square: 9 times

Total number of times shapes were taken out = 3 + 12 + 9 = 24

Probability of taking out a Triangle

= 3 / 24

= 1/8

Probability of taking out a Circle

= 12/24

= 1/2

Probability of taking out a Square

= 9/24

= 3/8

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If B is row-equivalent to a nonsingular matrix A, then B is also nonsingular.

Suppose that A is a nonsingular matrix, which means that A has an inverse denoted by A[tex]^{-1}.[/tex]

Now let B be a matrix that is row-equivalent to A. This means that we can obtain B from A by applying a finite sequence of elementary row operations.

Since elementary row operations do not change the row space of a matrix, the row space of B is the same as the row space of A. This means that B has the same rank as A.

Since A is nonsingular, it has full rank (i.e., rank(A) = n, where n is the number of rows or columns in A). Therefore, B also has full rank, which means that B is also a nonsingular matrix.

To see this more explicitly, suppose that B is singular, which means that there exists a non-zero vector x such that Bx = 0.

Since B is row-equivalent to A, we have that Ax = 0 (since the row space of B is the same as the row space of A).

But this contradicts the fact that A is nonsingular, since if Ax = 0 then x = [tex]A^{-1}Ax = A^{-1}0 = 0.[/tex]

Therefore, B cannot be singular and must be nonsingular.

In summary, if B is row-equivalent to a nonsingular matrix A, then B is N also nonsingular.

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The standard deviation of rainy days in March is approximately 2.55 days.

To find the standard deviation of rainy days in March, we first need to determine the expected value or the mean number of rainy days in March.

The expected value of a binomial distribution can be found using the formula: E(X) = np, where X is the random variable representing the number of rainy days in March, n is the number of trials (days in March), and p is the probability of success (rain) on a given day.

In this case, n = 31 (number of days in March) and p = 0.3 (probability of rain on any given day in March). Therefore, the expected value of rainy days in March is

E(X) = np = 31 × 0.3 = 9.3

Next, we need to find the variance of the binomial distribution, which is given by the formula: Var(X) = np(1 - p).

Var(X) = 31 × 0.3 × (1 - 0.3) = 6.51

Finally, the standard deviation of rainy days in March is the square root of the variance:

SD(X) = √Var(X) = √6.51 ≈ 2.55

Therefore, the standard deviation of rainy days in March is approximately 2.55 days.

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The percent markup is 20%

The selling price of the Nu is 900

The cost price of the Nu is 750

The percent markup can be calculated as follows

= 900-750/750 × 100

= 150/750 × 100

= 0.2 × 100

= 20%

Hence the percent markup is 20%

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When X and Y be independent random variables with X = N(0,1) and Y = exp(1) then E([[X|(Y+1)-1)=0.

To find the expected value E([X|(Y+1)-1]), we first need to clarify the expression inside the brackets. Since Y+1-1 = Y, the expression becomes E([X|Y]). Now, let's proceed to find E(X|Y):

1. X and Y are independent random variables, with X following a normal distribution N(0, 1) and Y following an exponential distribution with a rate parameter of 1.

2. To find the expected value of X given Y, we can use the property of independent random variables:

E(X|Y) = E(X), since Y's value does not affect X's expected value X.

3. Given that X follows a normal distribution with a mean of 0 and a variance of 1, the expected value E(X) is equal to its mean, which is 0.

So, E([X|Y]) = E(X) = 0.

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Answer:

15/8

Step-by-step explanation:

18/8 - 3/8 = 15/8

Answer:

15/8

Step-by-step explanation:

[tex]2 \times \frac{1}{4} - \frac{3}{8} [/tex]

First, combine the mixed fraction. 2 (2/1) is equal to 8/4 (multiply by 4/4). This comes out as 9/4.

9/4 - 3/8

Then, we need to multiply the first fraction by 2/2 to get a common denominator

18/8 - 3/8

Since the denominators are the same, we can subtract the numerators, 18 - 3 = 15.

The denominator is kept after doing the subtraction in the numerator. 15/8 is the answer, or 1 7/8 as a mixed fraction

The volume of the sphere is 11494.04 cubic millimeters

The correct answer is an option (B)

We know that the formula for the volume of the sphere is :

V = 4/3 × π × r³

where r is the radius of the sphere

Here, A sphere has a diameter of 28 millimeters.

so, the radius of the sphere would be,

r = d/2

r = 28/2

r = 14 mm

Using above formula the volume of the sphere would be,

V = 4/3 × π × r³

V = 4/3 × π × 14³

V = 11494.04 cubic millimeter

Therefore, the correct answer is an option (B)

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The surface area of the triangular prism is 75 ft squared.

The prism is a triangular base prism. The surface area of the prism can be found as follows:

surface area of the prism = (a + b + c)l + bh

where

Therefore,

a = 2 ft

b = 1.5 ft

c = 2.5 ft

l = 12 ft

Hence,

Surface area of the triangular prism = (2 + 1.5 + 2.5)12 + 2(1.5)

Surface area of the triangular prism = 6(12) + 3

Surface area of the triangular prism = 72 + 3

Surface area of the triangular prism = 75 ft²

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Answer:

1)1) 90

1)2)30

1)3)60

2)1)90

2)2)15

2)3)20

2)4)70

The value of angle O is 11 degrees

It is important to note that the properties of a triangle are;

From the information given, we have the angles;

m<N = 5x - 8

m<O = x - 5

m<P = 6x + 1

Also, the sum of the angles in a triangle is 180 degrees

Now, substitute the angles

m<O + m<P + m<O = 180

5x - 8 + x - 5 + 6x + 1 = 180

collect the like terms

5x + x + 6x = 180 + 12

add the terms

12x = 192

x = 16

For the angle, m<O = x - 5 = 16 -5 = 11 degrees

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We can see that there are two combinations (D=T, B=F and D=F, B=T) for which both statements are true. Therefore, the given statements are consistent.

The statement given is:

¬D ∨ B ≡ ¬(D ∧ ¬B)

To show whether the given statements are logically equivalent, we can create a truth table and check if the two statements have the same truth values for all possible combinations of the propositions.

Let's start with the truth table for the left-hand side of the given statement:

D      B      ¬D ∨ B

----------------------

T      T         T

T      F         T

F      T         T

F      F         F

Next, let's create the truth table for the right-hand side of the given statement:

D      B      D ∧ ¬B    ¬(D ∧ ¬B)

----------------------------------

T      T         F           T

T      F         T           F

F      T         F           T

F      F         F           T

Comparing the truth tables for both sides of the statement, we can see that they have different truth values for some combinations of D and B. Therefore, the given statements are not logically equivalent.

To determine if the given statements are contradictory or consistent, we can check if there is any combination of D and B for which both statements are true (consistent) or if there is no combination for which both statements are true (contradictory).

From the truth tables, we can see that there are two combinations (D=T, B=F and D=F, B=T) for which both statements are true. Therefore, the given statements are consistent.

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