Seems no clue to square the terms just with and
I would use difference method:
<-- square this and sum from 1 to n
...works... -->ans (c)
I'm trying to get used to TEX
I need help with this question involving an A.P.
The question says: If the sum of terms of an A.P is then the sum of squares of these terms will be equal to:
(a) (b) (c) (d)
What I did: Let the sum of n terms of the A.P be .
In equation (i)
I have found the value of . What should I do next?