Question

Find the number of permutations of the first 12 letters taken 3 at a time.

Answer 1

12 letters of the alphabet I assume?

Answer 2

I guess because that's all it says

Answer 3

\[\frac{ n! }{ (n-r)! }\]

Is the equation you want.

Answer 4

does permutations means u arent allowed to repeat letters

Answer 5

you have 12 letters, and you want to pick 3 of them
you hae 12 choices for the first letter you pick, leaving you with any one of the 11 other choices leaving you with 10 other choices
12*11*10