Symmetry ${}^n C_r = {}^n C_{n-r}$ (Choosing r is same as leaving n−r: nCr = nC(n−r))
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Choosing r is same as leaving n−r: nCr = nC(n−r)
What each symbol means
| Symbol | What it stands for |
|---|---|
| n,r | Integers 0≤r≤n |
When to use this
Standard binomial coefficients.