Um, Is This Correct?

My days of figuring out permutations and combinations are but distant memories. However I looked up the combination equation online and it says that:

n C k = n!/k!(n-k)!

where C indications a combination of n items from which one is choosing k at a time.

So if I had 7 items and was choosing 2 at a time, the number of combinations would be 21, right?

Rusty brain cogs won't let me trust my own answer...

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