Question

In an AP if a = 3, a, = 103 and S, = 1113, then n is​

Answer 1

Let a=113

d=108−113=−5

Assuming the nth term to be 0

We know:

T

n

=a+(n−1)d

∴0=113+(n−1)(−5)

⇒(n−1)=

5

113

=22.6

⇒n=23.6

∴ 24th term will be the first negative term.