Question

You need to know the number of different arrangements possible for five distinct letters. You decide to use the permutations rule, but your friends tells you to use 5!. Who is correct

Answer 1

Both Methods are correct..!!.

Thanks for ASK Me...!!

Answer 2

Both, you and your friend, are correct.

Explanation:

5 P 5 = 5!

A shortcut I learned is that in the permutation equation nPn when n is the same on both sides, it is equal to if you used factorial, n!.