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find-n-0-n-1-x-3n-2-calculate-n-0-n-1-8-n-

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Question Number 33708 by math khazana by abdo last updated on 22/Apr/18
find Σ_(n=0) ^∞ (n+1)x^(3n) 2) calculate Σ_(n=0) ^∞ ((n+1)/8^n ) .
find∑n=0∞(n+1)x3n2)calculate∑n=0∞n+18n.

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