1. For events A and B in S, which of the following formulas correspond to the probability that either A or B, but not both occur? (Select all that apply) a. P(A)+P(B)-P(A/B) b. P(A)+P(B)-2*P(ArB) c. P(A)+P(B) d. (P(A)- P(A B)) +(P(B)- P(Ar-B)) e. P(ABC)+ P(A~B)