Originally Posted by

**aman_cc** If you are attempting these problems, it would be assumed you know well about c(n,k)=n!/k!(n-k)! - How/why do you get this?

If not, its a good time to go back to your notes and wotj these out yourself.

This problem uses no more concepts that that. Most of the time the problems of combinotrics are tough because we need to break it up into simpler problem (which we can count easily), which comes with practice.

So try it out. Post your argument - how would you approach the problem "Select 4 gloves - such that there is no pair"