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solve (1/2)(n)(n+1)(n^2+n+1)=(100)(1/6)(n)(n+1)(2n+1)-(1/2)(n)(n+1)
solve (1/2)(n)(n+1)(n^2+n+1)=(100)(1/6)(n)(n+1)(2n+1)-(1/2)(n)(n+1)
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