- #1

- 19

- 0

## Homework Statement

consider the series: a + (a+d) + (a+3d) + (a+6d) + (a+10d) + (a+15d) .....

find a formula for nth term, and the sum of the first n terms.

## Homework Equations

I think, it is similar to the Fibonacci series.

## The Attempt at a Solution

well, I tried rearange and simplify it, but no clue!!