During a sale at a mens store, 16 white sweaters, 3 red sweaters, 9 blue sweaters, and

Question:

During a sale at a men’s store, 16 white sweaters, 3 red sweaters, 9 blue sweaters, and 7 yellow sweaters were purchased. If a customer is selected at random, find the probability that he bought.
a. A blue sweater
b. A yellow or a white sweater
c. A red, a blue, or a yellow sweater
d. A sweater that was not white