Selecting a sweater. At a men's clothing store, 12 men purchased blue golf sweaters, 8 purchased green sweaters, 4 purchased gray sweaters, and 7 bought black sweaters. If a customer is selected at random, find the probability that he purchased a.) A blue sweater
b.) A green or gray sweater
c.) A green or black or blue sweater
d.) A sweater that was not black
e.) A sweater that was not green or gray​