The sample space S of a random experiment is given by S = (a, b, c, d, e, f, g} and let A denote
the event and A = {a,b,c,d) and B the event and BA = {e,f} and B' n A = {a,b,c}.
Pr (A) = 0.6, Pr(B') = 0.3, Pr(g) = 0.1 are known. What is Pr(A'|B) = ?
{""" set difference operator and "|" conditional probability}