Chapter 0.5, Problem 4E

To determine

To evaluate: the given permutation.

Answer to Problem 4E

  $C{}_2=6$ .

Explanation of Solution

Given information:

  $C{}_2$

Solving the given permutation,

  $\begin{array}{c}C{}_2=\frac{4!}{2!\left(4-2\right)!}\\ =\frac{4!}{2!2!}\\ =\frac{4\times 3\times 2\times 1}{2\times 1\times 2\times 1}\\ =6\end{array}$

So,

After evaluating,

  $C{}_2=6$ .