Chapter 11.6, Problem 1C

To determine

To calculate: the factorial of $2!$ .

Answer to Problem 1C

The value of factorial $2!$ is $2$ .

Explanation of Solution

Given : the number $2!$ provided in the question,

Formula used:

  $n!=n(n-1)(n-2)\mathrm{......1}$

Calculation : toevaluate the $2!$ , put $n=2$ in the formula then multiply it.

  $\begin{array}{l}n!=n(n-1)(n-2)\mathrm{......1}\\ 2!=2·1\text{ [substitue n by 2]}\\ 2!=2\text{ [multiply]}\end{array}$

Hence,The value of factorial $2!$ is $2$ .