C = choose
like... 50 choose 3...
number of ways to choose 3 things from 50.
formula is something like n!/k!(n-k)!... I believe... it's been a long time since I did any math and didn't just look up an answer.
k is the number you are choosing, 3 in this case, and n is the total number... 50 in this case.
~D
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