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The probability of an outcome A is 1/6. The probability of the B outcome is 1/4. I...


Question

The probability of an outcome A is 1/6. The probability of the B outcome is 1/4. If the probability of A or B or both is 1/12, what is the probability of both outcomes A and B?

Options

A) 1/2

B) 1/3

C) 2/5

D) 3/4

The correct answer is B.

Explanation:

P(A outcome) = \(\frac{1}{6}\), P(B outcome) = ¼
P(A ∪ B) = 1/12, P(A ∩ B)
P(A ∩ B) = P(A) + P(B) − P(A ∪ B)
1/6 + 1/4 − 1/12
= (2 + 3 − 1) ÷ 12
= 4/12
= 1/3
P(A ∩ B) = 1/3

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Dicussion (1)

  • P(A outcome) = \(\frac{1}{6}\), P(B outcome) = ¼
    P(A ∪ B) = 1/12, P(A ∩ B)
    P(A ∩ B) = P(A) + P(B) − P(A ∪ B)
    1/6 + 1/4 − 1/12
    = (2 + 3 − 1) ÷ 12
    = 4/12
    = 1/3
    P(A ∩ B) = 1/3

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