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Let S1,S2,S3S_{1},S_{2},S_{3}S1,S2,S3 denote the sums of the first nnn positive integers, their squares, and their cubes respectively. Find
S3(1+8S1)(S2)2. \frac{S_{3}(1+8S_{1})}{(S_{2})^{2}} .(S2)2S3(1+8S1).
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