EMP Q.30

If P(A) > 0, P(B) > 0 and P(A/B) = P(B/A), then
                                 P (A) = P(B).

If A and B mutually exclusive, then
P (A/B') = P (A)/(1 - P (B)).

If A and B are independent, then
        P(A∪B) = 1-P(A').P(B')

All of these