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Question 67 of 89

Q.If A and B are two events such that P(A)=0.4P(A)=0.4, P(B)=0.8P(B)=0.8 and P(B/A)=0.6P(B/A)=0.6, then P(A‾∩B)P(\overline{A} \cap B) is:

(a) 0.56
(b) 0.96
(c) 0.66
(d) 0.24
Puducherry TnboardTamil Nadu HSC First Year (DGE) Board 2022MCQ· 1mImportance★★★★★
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P(A‾∩B)=P(B)−P(A∩B)=0.8−0.24=0.56P(\overline{A}\cap B) = P(B)-P(A\cap B) = 0.8-0.24 = 0.56.

First find P(A∩B)P(A\cap B) using the conditional probability formula: P(B/A)=P(A∩B)P(A)P(B/A) = \dfrac{P(A\cap B)}{P(A)}, so P(A∩B)=P(B/A)⋅P(A)=0.6×0.4=0.24P(A\cap B) = P(B/A)\cdot P(A) = 0.6\times0.4 = 0.24.

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