A textbook sales representative is responsible for 25 schools and needs to choose three of these schools to work with today. The number of different ways he can schedule a time to call these schools is ------- .

Question

Quizplus · Accepted Answer

The number of ways to choose 3 schools out of 25 is calculated using the combination formula, which is C(n, k) = n! / [k!(n-k)!]. Here, n=25 and k=3, so the calculation is 25! / [3!(25-3)!] = 25! / (3!22!) = (25*24*23) / (3*2*1) = 13,800.

A Textbook Sales Representative Is Responsible for 25 Schools and Needs