Question

#BrainTeaser03

Solve the given $\varphi$ series.

$\displaystyle 31\varphi + \sum_{n=1}^\infty \dfrac{(-1)^{n-1}n^3}{\varphi^{n-1}}$

Answer 1

Answer:

5²√6⁴ + 7

= 25√1296 + 7

= 25√1303

= 36.097

Hope this helps you :)

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Answer 2

Answer :-

$\sf \left(\sum _{n=1}^{\infty}n^{3}\times 4^{1-n} \left(-1\right)^{n+1}\right)+31ϕ$

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