Question

Suppose we want to choose 6 letters, without replacement, from 9 distinct letters.How many ways can this be done, if the order of the choices matters? How many ways can this be done, if the order of the choices does not matter?

Answer 1

Explanation:

if the order matters

It would be 9 permunte 6

9 x 8 x7 x 6 x5 x4

If the order doesn't matters

it would be 9 combine 6

9 x 9 x9 x9 x9 x9

I hope this helps