Question

AP for A.P first term in 2 and
Common different is 3 find Sn and s12​

Answer 1

Answer:

Sn=n/2{2.2+(n-1).3}

=n/2{4+3n-3}

=n/2(1+3n)

S12=2+(12-1)3=2+11.3=2+33=35