Question

How many ways can a $7$ letter word be arranged.

Answer 1

Number of ways,

Arrangement $=n!$

Number of ways a $7$ word letter can be arranged

$$\begin{gathered} =7! \\ =7\times 6\times 5\times 4\times 3\times 2\times 1 \\ =5040 \end{gathered}$$

Hence, Number of ways a $7$ word letter can be arranged $5040$