Question

which of the following cannot be the general term of the Ap and why? 4n+3,3n^2+5,2n-4/5

Answer 1

3n²+5 cannot be the general term of the A.P becauce general term of the A.P cannot be quadratic

PROOF:
lets take 4n+3
then the sequence is 7,11,15,...
11-7=15-11
3=3
hence , it is an A.P


BUT,when we take 3n²+5
the sequence is 8,17,32,...
17-8≠32-17
9≠15
hence it is not an A.P

Answer 2

it is not an A.P.......