Question

The sum of first n terms of an AP is given by Sn=3n^2-n. Find the AP

Answer 1

Answer: Sn=3n^2-n

Put n=1

S1=3(1)^2-1

S1=2

And S1 =A1

Put n=2

S2=3(2)^2-2

S2=10

A1+A2=10

2+A2=10

A2=8

D=A2-A1

D=6

Ap:2,8,14,20,26,.......

May it helps