Question 1104087
You are dealing with permutations where you have n itmes
:
For example 3 P 2 means you have three items from which you are making selections
:
3 P 2 = 3 * (3-1) = 6 (for the first choice you have 3 to pick from, for second choice you have 2 to pick from)
:
5 P 3 = 5 * (5-1) * (5-2) = 60
:
10 P 3 = 10 * (10-1) * (10-2) = 720