In a library box, there are 8 novels, 8 biographies and 8 war history books. If Jack selects two books at random, what is the probability of selecting two different kinds of books in a row?

Answer 1

your outcomes are NB, NW, BW
prob(your event)
= (C(8,1)*C(8,10) + C(8,1)*C(8,1) + C(8,1)*C(8,1))/C(24,2)
= (64+64+64)/276
= 192/276
= 16/23 = appr .696

Answer 2

THIS IS SOOOO EASY!!! 69 is the answer