Question

HELP

Answer 1

The sum of first n terms of an AP is 3n + n^2 then
(1)find the first term and sum of first two terms
(2)find second , third and 15 th term

Answer 2

Sum of first \(n\) terms = \(3n + n^2\)

plugin n = 1, you wil get first term !

Answer 3

first term = \(3*1 + 1^2 \)

Answer 4

simplify

Answer 5

Thank you!!

Answer 6

i was trying to do this using the sum of n terms (AP) formula but now i get that this is such a stupid problem lol