Question

Which of the following cannot be the sum of n terms of an A.P.?
(1) 3n² + 5n +7
(2) 3n² +5n
(3) n² +4n
(4) n²-1/2​

Answer 1

Answer:

1 option is right

please mark the Brainlest

Answer 2

Answer:

(4) n²-1/2

hope this helps you...