Binomial coefficient (n choose k) equals (n choose (n-k))
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Theorem
The following formula holds: $${n \choose k} = {n \choose n-k},$$ where ${n \choose k}$ denotes the binomial coefficient.
Proof
References
- 1964: Milton Abramowitz and Irene A. Stegun: Handbook of mathematical functions ... (previous) ... (next): 3.1.3
