Question

If sum of the first nth terms of an AP is Sn= 3n2+3 then the 3rd term is

Answer 1

Answer:

Third term a₃ = 15

Step-by-step explanation:

$S_{n}$ = 3n² + 3

Third term  a₃ = S₃ - S₂

                       = [ 3(3)² + 3] - [ 3(2)² + 3]

                       = 27 - 12

                       = 15