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Combin(49,2) = 49!/(47! * 2!) = 49 * 48/2 = 1176

...as a formula:

C(N,R) = N!/[(N-R!) * R!]

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Make it simpler please. Spell it out. What does the "C" stand for? What does "N" stand for? What does "R" stand for?
Is "Combin" short for "possible combinations" or does it mean to "combine two numbers or probabilities" You need to define your variables.