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Input:
sum1n(k)
Write:
`sum1n(k)`
Compute:
$$\sum _{k=1}^n k$$
Output:
$$\sum _{k=1}^n k== \frac{1}{2}\ n+\frac{1}{2}\ {n}^{2}$$ Result: $$\frac{1}{2}\ n+\frac{1}{2}\ {n}^{2}$$
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