Chapter 12.6, Problem 20P

Find the value of each expression.

${}_5{C}_4$

To determine

Find the value of the given expression.

Answer to Problem 20P

5

Explanation of Solution

Given:

The given expression is :

  $C{}_4$

Formula Used:

  $C{}_r=\frac{n!}{r!(n-r)!}$

Calculation:

  $C{}_4=\frac{5!}{4!(5-4)!}=\frac{5!}{4!1!}=\frac{5\cdot 4!}{1!4!}=5$ .