Mathematics: An experiment involves 31 participants. From these, a group of 5 participants is to be tested under a special condition. How many groups of 5 participants are possible?

An experiment involves 31 participants. From these,

coolkid2041

25.01.2022

169911 groups of 5 participants are possible

Step-by-step explanation:

Total no. of participants = 31

We are supposed to find no. of groups of 5 participants are possible

We will use combination over here :

Formula : $^nC_r=\frac{n!}{r!(n-r)!}$

Substitute r = 5

n = 31

So,no. of groups of 5 participants are possible = ^nC_r

So,no. of groups of 5 participants are possible:

$\frac{31!}{5!(31-5)!}=169911$

Hence 169911 groups of 5 participants are possible

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globalremix

31.07.2020

actually the khan academy version is 10(7−4p) because i tried just 10 and it didn't work so this is the khan academy answer

Step-by-step explanation:

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