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If (1+x+x^2++x^p)^n=a0+a1x+a2x^2++a(n p)...

If `(1+x+x^2++x^p)^n=a_0+a_1x+a_2x^2++a_(n p)x^(n p),` then find the value of `a_1+2a_2+3a_3+ddot+n pa_(n p)dot`

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