Solved Examples
Ex1:
Find the value of 5!.
Sol:
We know that: n! = n(n – 1) . . . . . 3 . 2 . 1.
∴ 5! = 5 . 4 . 3 . 2 . 1 = 20 . 6 = 120.
Ex2:
Evaluate
Sol:
We know that: n! = n(n – 1)!.