#1**+2 **

a permutation is like you want to select x people from a group of y people

the formula is x*(x-1)*(x-2)*...../y!

(e.g. 4 people from 12 people)

12*11*10*9/4! = 11880/24=495 (ways)

KitSoundwave Feb 2, 2021

edited by
KitSoundwave
Feb 2, 2021

edited by KitSoundwave Feb 2, 2021

edited by KitSoundwave Feb 2, 2021

edited by KitSoundwave Feb 2, 2021

edited by KitSoundwave Feb 2, 2021

edited by KitSoundwave Feb 2, 2021

edited by KitSoundwave Feb 2, 2021

#2**+1 **

Hi Kitt,

What you have described in words is a combination

For example, 3 people are chosen from 10. How many COMBINATIONS are possible 10C3=120 would be the answer?

For permutations, order matters.

For example. 10 people run in a race, how many PERMUTATIONS are possible for 1st, 2nd and 3rd places.

This is the same as: choose 3 from 10 when order matters. 10P3=720 ways.

Melody Feb 3, 2021