A. The number of fabric-pattern-color combinations is 4 * 13 * 9 = 468
B. P(1st choice) = no of novels / total books = 3/6 = 1/2 P(2nd choice) = no of remaining novels/ total remaining books = 2/5 P(both novels) = 1/2 * 2/5 = 1/5 (without replacement assumed)
C. P(1st choice) = no of biographies / total books = 2/6 = 1/3 P(2nd choice) = no of remaining biographies/ total remaining books = 1/5 P(both biographies) = 1/3 * 1/5 = 1/15 (without replacement assumed)
D. P(1st choice) = no of history books / total books = 1/6 P(2nd choice) = no of novels/ total remaining books = 3/5 P(a history, then a novel) = 1/6 * 3/5 = 1/10 (without replacement assumed)
