Q. 30

Mark the correct alternative in each of the following:

If P(A) = 3/10, P(B) = 2/5 and P(A B) = 3/5, then P(A/B) + P(B/A) equals

A. 1/4

B. 7/12

C. 5/12

D. 1/3

Answer :

P(A) = , P(B) = , P(AB) = (Given)


According to the addition theorem of probability for two events A and B we have,


P(A) + P(B) – P(AB) = P(AB)






Now then,






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