• anonymous
Show that: $1*3+2*3^{2}+...+n3^{n} =\frac{ (2n-1)3^{n+1}+1 }{ 4 }$ for every number n where $n \in \mathbb{N}, \mathbb{N}>0$ If you try the induction formula with n=2,3 it get's wrong so is it the right conclution to just say that it isn't correct for all positive n ?
Mathematics

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