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Q.

If A and B are events such that P(A¯∪B¯)=34,P(A¯∩B¯)=14 and P(A)=13 , then P(A¯∩B) is

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a

512

b

38

c

58

d

14

answer is A.

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Detailed Solution

P(A¯∪B¯)=34⇒P(A∩B¯)=34⇒P(A∩B)=14P(A¯∩B¯)=14⇒P(A∪B¯)=14⇒P(A∪B)=34P(A)=13∴P(A¯)=23 Now, P(A¯∩B)=P(B)−P(A∩B) Also, P(A∪B)=P(A)+P(B)−P(A∩B)⇒34=13+P(B)−14∴P(B)=34−112=23∴P(A¯∩B)=23−14=512
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