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AHSME 1968 Problem 27

    Let Sn=1−2+3−4+⋯+(−1)n−1nS_n=1-2+3-4+\cdots +(-1)^{n-1}n, where n=1,2,⋯n=1,2,\cdots. Then S17+S33+S50S_{17}+S_{33}+S_{50} equals: (A) 0(B) 1(C) 2(D) −1(E) −2\text{(A) } 0 \text{(B) } 1 \text{(C) } 2 \text{(D) } -1 \text{(E) } -2

    Dataset text NuminaMath-1.5. Quoted with source.

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