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

#1**+1 **

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