General term $T_{r+1}$ ((r+1)th term in (a+b)^n is nCr a^{n−r} b^r (0-indexed r).)
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(r+1)th term in (a+b)^n is nCr a^{n−r} b^r (0-indexed r).
What each symbol means
| Symbol | What it stands for |
|---|---|
| n | Exponent |
| r | 0≤r≤n |
When to use this
Finite expansion.