Even / odd binomial sums (For n≥1, sums of even-r and odd-r binomial coeffs each equal 2^{n−1}.)
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For n≥1, sums of even-r and odd-r binomial coeffs each equal 2^{n−1}.
What each symbol means
| Symbol | What it stands for |
|---|---|
| n | Positive integer |
When to use this
From (1+1)^n and (1−1)^n.