the order does not matter. There are 21P3 ways to select an ordered group of 3 items from 21.
Whoever is chosen first, there are 21 available people.
20 for the 2nd, and 19 for the 3rd.
In how many ways can a school president, a vice-president, and secretary be chosen from 21 students?
I'm not sure to find this answer since there is no order in which they are chosen.
1 answer