If A & B are two events such that p(A)≠0 & P(B)≠1,then P(A′/B)
IF A and B are any two events such that P(A) + P(B) - P (A and B ) = P(A), then (a) P(BA)=1 (b) P(AB)=1 (c) P(BA)=0 (d) P(AB)=0