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Q.

Let A and B be two events such that P(A∪B¯)=1/6, P(A∩B)=1/4 and P(A¯)=1/4, where A¯ stands for  complement of event A. Then events A and B are

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a

equally likely but not independent

b

equally likely and mutually exclusive

c

mutually exclusive and independent

d

independent but not equally likely

answer is D.

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Detailed Solution

We have,P(A∪B¯)=16,P(A∩B)=14P(A¯)=14⇒P(A)=1−14=34∴ P(A∪B→)=1−P(A∪B)=1−[P(A)+P(B)−P(A∩B)]⇒ 16=1−34−P(B)+14⇒ P(B)=1−12−16=6−3−16=26=13⇒PA∩B=PAPB=14
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