Define your event as [A occurs and B does not occur] or as [A occurs and B' occurs] where B' is the complement of B.
Equivalently, this is the event that [A and B' both occur].
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P(A given B')=[P(A)-P(AnB)]/[1-P(B)].In words: Probability of A given B compliment is equal to the Probability of A minus the Probability of A intersect B, divided by 1 minus the probability of B.
P(A'/B)=P(A'nB)/P(B)
Prob(A given B) = Prob(A and B)/Prob(B)
It means multiply, Probaility of A and B means probability of A multiplied by probability of B.
b is incorrect while c is virtually meaningless.