Chapter 3 - Probability - Section 3.4 Additional Topics in Probability and Counting - Exercises - Page 175: 38

Total farms = 50 Contaminated farms = 8 Non-contaminated farms = 42 to obtain 2 contaminated farms from 8 = 8! / (8-2)! 2! = 28 To obtain 8 farms from 42 = 42! / (42-8)! 8! = 118,030,185 No. of ways to select 2 contaminated and 8 non-contaminated farms = 28 x 118,030,185 = 3,304,845,180

As given in answer