1. A box contains 23 items, 7 of which are defective. If 5 are sold at random, find the following probabilities. a) Exactly 3 are not in good condition b) None is defective. c) All are defective d) At least 1 is defective.

2. A bookstore has 8 Algebra with Trigonometry and 7 Introduction to Biology books available. If two customers purchased a book, find the probability that: a) one of each book was purchased b) only Algebra with Trigonometry books were bought c) only Introduction to Biology books were bought