Question

if the sum of n terms of a sequence be n square + 2 and then prove that a sequence is an ap

Answer 1

Answer:

Step-by-step explanation:

Sn = n^2+2

S1 = a1 = 1^2 + 2 = 3

a2= S2-S1 = 2^2 +2 - 3 = 3

a3 = S3 -S2 = 3^2+2 - 3 = 8

This is not an ap