So if I am making n decisions, and exactly five of them are a specific decision, how many different total decision combinations result in that?

I think that the answer is combinations, nCr, but I'm really confused around that.

Combinations says, if I put n things in a bag, and try out all the ways of taking r of them out, and consider the same items in a different order to be the same ....

Anyway I think it is permutations, not combinations ...