6. A college library has five copies of a certain text on reserve.

Two copies (1 and 2) are first printings, and the other three (3, 4, S A ´ C A ¨ C B ´ C B ¨ C and 5) are second printings. A student examines these books in random order, stopping only when a second printing has been selected. One possible outcome is 5, and another is 213.

a. List the outcomes in .

b. Let A denote the event that exactly one book must be examined. What outcomes are in A?

c. Let B be the event that book 5 is the one selected. What outcomes are in B?

d. Let C be the event that book 1 is not examined. What outcomes are in C?