Question

16. Find the value of (5)
​

Answer 1

Answer:

The first one is by using your mind. If you know that factorial of any non negative integer denoted by n! defined as

n!=n(n−1)(n−2)⋯3⋅2⋅1 then 5!=5∗4∗3∗2∗1 . You can calculate it in your mind which will give you 5!=120. That's it.

The next method is using your calculator. In my calculator Casio fx-991es, I pressed 5 and then shift+ x−1 button and I got 120. Similarly, you can use Google to calculate it like I did and got this.

Answer 2

Hope it helps you........