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SeriesCoefficient[(1 - x^m)^n/(1 - x)^(n + 1), {x, 0, n m - s}] for n=3, m=50, s=120
SeriesCoefficient[(1 - x^m)^n/(1 - x)^(n + 1), {x, 0, n m - s}] for n=3, m=50, s=120
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