Question

The sum of first n terms of an A.P
is given by the formula Sn = 3n² + n
then its 3rd term is​

Answer 1

Answer:

If Sn=3n²+2n is the sum of first n terms of arithmetic progression, how do you find the third term of the sequence? In the AP, Sn = 3n^2+2n. ... So the third term of the AP = a + 2d = 5+12 = 17. Answer.

Step-by-step explanation:

Answer 2

Answer:

Sn = 3n^2 + n

Given— n = 3

•°• S3 = 3 (3)^2 + 3 = 27 + 3 = 29

so, answer is 29