Consider the sample space S = {a,b,c,d} and assign probabilities to the elementary events as P(a) = 1/7, P(b) = 2/7, P(c) = 4/7, P(d) = 0
a) compute the probabilities of all compound events
b) Find two sets A and B such that AB doesnt equal B, But P(AB) = P(B)