Harold and Mary are studying for a test.
Harold's chances of getting a "B" are 80%. Sharon's chances of getting a "B" are 90%.
The probability of at least one of them getting a "B" is 91%.a. What is the probability that only Harold gets a "B"?b. What is the probability that only Sharon gets a "B"?c. What is the probability that both won't get a "B"?