   Chapter 14.1, Problem 63E ### Algebra and Trigonometry (MindTap ...

4th Edition
James Stewart + 2 others
ISBN: 9781305071742

#### Solutions

Chapter
Section ### Algebra and Trigonometry (MindTap ...

4th Edition
James Stewart + 2 others
ISBN: 9781305071742
Textbook Problem

# 6 1 - 7 4 Combinations These exercises involve counting combinations.Raffle In a raffle with 12 entries, in how many ways can three winners be selected?

To determine

To find:

The number of ways of selection of three winners.

Explanation

Given:

The total number of entries in a raffle is 12.

The total number of winners to be selected at a time is 3.

Approach:

The number of combination (or selection) of n objects taken r at a time is

C(n,r)=n!r!(nr)!(1)

Calculation:

Substitute 12 for n, 3 for r in equation (1)

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