Question

the sum of first n terms of an ap is given by (n2+2n).find the 12th term of the progression.

Answer 1

Answer:

The 12th term ie. a12 is 26

hope it helps you thanks

Step-by-step explanation:

Sn=n^2+2n given

S11=11^2+11×2=121+22=142

S12=12^2+12×2=144+24=168

we know that S12-S11=A12

168-142=26