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If P(A) = 0.6 and P(B|A) = 0.4, what is P(A and B)?Group of answer choices0.400.60.24

Question

If P(A) = 0.6 and P(B|A) = 0.4, what is P(A and B)?

Group of answer choices:

  • 0.4
  • 0.6
  • 0.24
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Solution

To find P(A and B) P(A \text{ and } B) , we can use the definition of conditional probability. The formula for conditional probability is:

P(BA)=P(A and B)P(A) P(B|A) = \frac{P(A \text{ and } B)}{P(A)}

We are given:

  • P(A)=0.6 P(A) = 0.6
  • P(BA)=0.4 P(B|A) = 0.4

We need to find P(A and B) P(A \text{ and } B) . Rearrange the formula to solve for P(A and B) P(A \text{ and } B) :

P(A and B)=P(BA)×P(A) P(A \text{ and } B) = P(B|A) \times P(A)

Substitute the given values into the formula:

P(A and B)=0.4×0.6 P(A \text{ and } B) = 0.4 \times 0.6

Calculate the product:

P(A and B)=0.24 P(A \text{ and } B) = 0.24

So, the probability P(A and B) P(A \text{ and } B) is 0.24 0.24 .

This problem has been solved

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