Math, asked by IFTHI, 1 year ago

If the sum of the first n terms of an AP is given by Sn = 3n2 + 2n , find the nth term of the AP

Answers

Answered by vikashkumar230

nth ter represent by 5-6n

Attachments:

IFTHI: I am not getting 5-6n

vikashkumar230: yaaa

vikashkumar230: multiply _ with ans

IFTHI: the ans is not 6n-5

IFTHI: its6m-1

IFTHI: 6n-1

Cinderalla34: You can open the bracket in my ans and will get the same answer

vikashkumar230: i ll try after some time

vikashkumar230: now i m in classs

vikashkumar230: sorrrryyyyyy

Answered by Cinderalla34

Sum of 1 term n = 1.
S1 = 3 × 1^2 + 2 × 1 = 5
Sum of 2 terms n = 2
S2 = 3× 2^2 + 2 × 2 = 3×4 + 4 = 16.
Second term = S2 - S1 = 16 - 5 = 11.
Common difference = second term - first term = 11 - 5 = 6.
Therefore n th term = 5 + (n-1)×6.
Hope you understood my answer.
Pls mark me as the brainliest if so

IFTHI: what does * mean

IFTHI: what does sup* mean

Cinderalla34: sup means superscript

Cinderalla34: Used to show words above the normal writing line

IFTHI: oh u mean this ^

IFTHI: k thnx

Previous Question

Next Question