When to use the formula (nCr x nCr)/nCr?

[jasper10]

Homework Statement

I was wondering for what situations one uses the formula:
(nCr x nCr)/ nCr ?
Thanks

Homework Equations

nCr

 

[vela]

I was wondering for what situations one uses the formula:
(nCr x nCr)/ nCr ?

You mean (nCr x nCr)/ nCr = nCr? ;)

There's a reason you use different letters to represent different quantities. It's hard to answer your question when you have removed all that information from the formula.

 

[jasper10]

well i mean for example,

5C2 x 4C3 / nCr