A) \[\frac{n(n+1)\sqrt{5}}{2}\]
B) \[\frac{n(n+1)}{\sqrt{2}}\]
C) \[\frac{n}{2}\left( \frac{(n+1)}{\sqrt{5}} \right)\]
D) \[n(n+1)\sqrt{5}\]
Correct Answer: A
Solution :
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