Question

Prove that O!= 1 with explanation.​

Answer 1

Answer:

By Definition of Combinations If you Try To find nCn using multiplication principle of counting, you will gat answer as n!.

Now apply formula of nCr the it comes out to be n!/0!

now by equality, you will get 0!=1

Answer 2

Answer:

We knew that-

0–0 = 1–1

so now let's take 0 and 1 both as common

0(1–1) =1(1–1)

0 = 1(1–1)/(1–1)

0 = 1