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I think another name is called: Binomial Coefficient. Like 4 choose 3 = 4! / (3!*(4-3)!)

When would this be used in the real world, if that make sense.

DeadRight  Jul 14, 2017
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 #1
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Ex:

The number of ways that 5 children can be chosen from 8 is     8 chose 5     or 8C5

 

So it is used in counting problems.

 

Also note that every time 5 children are chosen, 3 are not chosen.

So 8C5=8C3

 

Or more generally

nCr  = nC(n-r)

 

If that is not quite what you want to know then say so and someone, maybe  me, will try to help further. :)

Melody  Jul 14, 2017
edited by Melody  Jul 14, 2017
 #2
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Thank you. THat make sense.

Guest Jul 14, 2017

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