Question

Can someone please explain this problem to me?

Answer 1

\[\sum_{0}^{\infty}\frac{ 1 }{(\sqrt{5})^n } = \sum_{0}^{\infty} \left( \frac{ 1 }{\sqrt{5} } \right)^n\]
\[a=1 , r= \frac{ 1 }{ \sqrt{5} }\]
\[Sum = \frac{ a }{ 1-r } = \frac{ 1 }{ 1-\sqrt{5} } = \frac{ \sqrt{5} }{ \sqrt{5}-1 }\]


LOL. Nevermind.... I got it...