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Input:
partialsum(k)
Write:
`partialsum(k)`
Compute:
$$\sum _{k=0}^n k$$
Output:
$$\sum _{k=0}^n k== \frac{1}{2}\ n+\frac{1}{2}\ {n}^{2}$$
Result: $$\frac{1}{2}\ n+\frac{1}{2}\ {n}^{2}$$
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