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What is Permutation?

 Feb 2, 2021
 #1
avatar+267 
+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)

 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
avatar+113783 
+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.

 Feb 3, 2021

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