Mathematics Part-II

Book: Mathematics Part-II

Chapter: 13. Probability

Subject: Maths - Class 12th

Q. No. 9 of Exercise 13.2

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If A and B are two events such that P (A) = 1/4 , P (B) = 1/2 and P (A B) = 1/8, find P (not A and not B).

Given: P (A) =, P (B) = and P (A B) =

P(not A and not B) = P(A B)


As, { A B =(A B)}


P(not A and not B) = P ((A B))


= 1 - P (A B)


= 1- [P(A) + P(B) - P (A B)]




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