Question

Find the second term and the nth term of an A.P. whose 6th term is

12 and the 8th term is 22. Also find sum of first 22 terms . Or In an a.p 3

15 , 27 ,... Which term is 120 less than its 93rd term.
..

help me to solve this question..

i will mark u brainlist answer .​

Answer 1

Answer:

A6=12andA8=22

a+5d=12-------eqn 1

a+7d=22-------eqn 2

Subtracting eqn 1 from eqn 2,we get,

2d=10

=>d=5

=>a+5d=12

=>a+5×5=12

=>a=12-25

=>a=-13

A2= - 13+5

=-12

S22=22/2+(22-1)5

=11+21×5

=11+105

=116