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    OlympiadEasyNumber Theory5–6

    Sum of Series

    Soma de Série

    Find the sum 1+2+3+…+1001 + 2 + 3 + \ldots + 100.

    Use Gauss's formula: n(n+1)2\frac{n(n+1)}{2}.

    Solution

    Step 1 of 2

    1. 1.Using Gauss's formula: