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Q.

Let A and B be two events. Suppose P(A)=0.4,P(B)=p, and P(A∪B)=0.7. The value of p for which A and B are independent is

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a

13

b

14

c

12

d

15

answer is C.

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Detailed Solution

P(A∪B)=P(A)+P(B)−P(A)×P(B)⇒ 0.7=0.4+p−0.4p∴ 0.6p=0.3 or p=12

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