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The combination nCr is defined as
An!/((n-r)!)^2
Bn!/(r!(r-n)!)
Cn!/(r!(n-r)!)
Dn!/(r!(n+r)!)
Answer & Solution
Correct answer: C. n!/(r!(n-r)!)
nCr equals n factorial divided by r factorial times (n - r) factorial, for 0 <= r <= n.
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