How many 5-permutations of Q are there? (No repetition of character within a string and order matters)
Q = {A, B, C, D, E}.
So I think i'm supposed to be using the formula $(^n_k) = \frac{n!}{(n-k)!(k!)}$
I think I know what I'm doing but not sure. Is it correct to say $5!/(5-5)!(5!)$ which $ = 120/1*120 = 1$ ?
If you are looking for permutaion with $5$ different elements, then the answer is $5! = 120$