Question

find ap whose sum to n terms is 4nsquare -n

Answer 1

4n²-n

when n=1
S1=3

when n =2
s2=14

n=3
S3=33

a2=S2-s1=11
A3=s3-s2=19

d=19-11=8

therefore ap is 11,19,27,35,43....



hope it is helpful