Question

The sum of first 'n' terms of an arithmetic progression is given by the formula Sn=3n2+n, then it's 3rd term is

Answer 1

Answer:

16

Step-by-step explanation:

Sn=3n^2+n

S1=3*1^2+1

=3*1+1

=4

S1=First term=4

S2=3*2^2+2

=3*4+2

=14

second term=S2-S1

=14-4

=10

common difference = 10-4

=6

Third term=10+6

=16