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Question Number 121339 by Eric002 last updated on 06/Nov/20

$$provethat$$$$\left(\begin{array}{c}n\\ 1\end{array}\right)+\left(\begin{array}{c}n\\ 4\end{array}\right)+\left(\begin{array}{c}n\\ 7\end{array}\right)+....=\frac{1}{3}(2^n+2cos\frac{(n-2)\pi }{3})$$

Answered by mindispower last updated on 06/Nov/20

$$whstis$$$$thelogique$$$$\sum _k\left(\begin{array}{c}n\\ g\left(k\right)\end{array}\right),whatisg\left(k\right)$$$$$$

Commented by Eric002 last updated on 06/Nov/20

$$therewasatypoicorrectedit$$

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