Question

if end term of the AP 9 7 5 9....AP 15 12 9 find n​

Answer 1

A.P is 15,12,9

=>> common difference = 12-(15) = -3

First term is 15

Therefore nth term

=>> a+(n-1)d

=>> 15 + (n-1) -3

=>> 15 -3n + 3

=>> 18 -3n