Wipro Company Numerical Ability Probability

If P(A) = 1/4,P(B)=2/5 and P(AUB) = 1/2, then P(A intersection B) is
a)0.15 b)0.10 c)0.12 d)0.32

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ans :- option a
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Wipro Other Question

if P(A) = p and P(B)=q,then P(A`UB`)(when A and B is independent) is
a)pq b)(1-p)(1-q) c)1-pq d)none If P(A) = 0.75 and B is an event which is mutually exclusive with A,P(A intersection B)=
a)0.25 b)0.35 c)0.81 d)none