Question

In an A.P whose sum to 'n' terms is given by S.=2n2 +
on then the second term is
a) 10
b) 20
c) 8
d) 12​

Answer 1

Sₙ=2n²+n

S₁=2(1)+1=3

S₂=2(2)²+2=10

A₂=S₂-S₁=10-3=7

So the second term of this AP is 7.