Best-Selling Albums. Refer to Exercise 1.44.

a. List the 15 possible samples (without replacement) of four artists that can be selected from the six.

b. Describe a procedure for taking a simple random sample of four artists from the six.

c. If a simple random sampling procedure is used to obtain four artists, what are the chances of selecting P, A, L, and R? O, R, T, and P?