Question

If the sum of n terms of an A.P. be 3n^2 +n, then its first term is ??
First to answer correctly with full explanation will be marked brainliest..
pls help​

Answer 1

Answer:

4

Step-by-step explanation:

Here Sn = 3n^2 + n

So S1 (sum of 1st term, that is, the first term itself) = 3(1)^2 + 1 = 4