Binomial coefficient (n choose n) equals 1
From specialfunctionswiki
Theorem
The following formula holds: $${n \choose n} = 1,$$ where ${n \choose n}$ denotes the binomial coefficient.
Proof
References
- 1964: Milton Abramowitz and Irene A. Stegun: Handbook of mathematical functions ... (previous) ... (next): 3.1.5