Question

If sum of first m terms of AP is 2m square+3m.Then what will be its Second term?..

Answer 1

we know that,
S_n - S_(n-1) = a_n

So,
a_2 = S_2 - S_1

= {2m^2 + 3m} - {2m^2 + 3m}
= {2(2^2) + 3(2)} - {2(1^2) +3(1)}
= 8 + 6 - 2 + 3
= 14 - 5
= 9