Question

The sum of first ‘n’ terms of an arithemetic progression is given by the formula

Sn

= 3n2 + n, then its 3rd term is​

Answer 1

Step-by-step explanation:

sn= 3n + n

s3 = 3(3) +3

s3 =9 +3

s3 = 12

Answer 2

Answer:

The sum of first ‘n’ terms of an arithemetic progression is given by the formula

Sn

= 3n2 + n, then its 3rd term is