A series of series

Level 1

What comes next in the series:

$1, 7, 19, 37, 61, \dots$

100 71 91 131

1 solution

Ashish Menon
Apr 25, 2016

The $n^{th}$ number in the sequence is found out by $(6 × \displaystyle \sum_{i = 1}^{n - 1} i) + 1$

So, the $6^{th}$ number in the sequence would be $(6 × \displaystyle \sum_{i = 1}^{5} i) + 1$
= $\boxed{91}$

Yes, you got it :). Ashish the Question that you posted right now, please check it for value $\frac{225}{64}$ , this is the value i am getting, I have crosschecked. Please check it.

Abhay Tiwari - 5 years, 1 month ago

You are very very very very near. :)

Ashish Menon - 5 years, 1 month ago

A series of series

1 solution

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