InterviewSolution
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(1+x+x^2 + ……+x^p)^n = a_0 + a_1x + a_2 x^2 + ….+a_(np) x^(np) rArr a_1 + 2a_2 + 3a_3 + ……+np .a_(np) = |
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Answer» `(np(p+1)^n)/(2)` |
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