Question

Chapter : Arithmetic and geometric progression
The first and the last term of an AP are 17 and 350 respectively. If the common
difference is 9, how many terms are there and what is their sum?

Answer 1

hope it helps........

Answer 2

Step-by-step explanation:

first term =17

last term =359

d=9

añ=a+(n_1)d

350=17+(n_1)×9

350_17=(n_1)×9

(n_1)=3333/9

n=37 +1

=38

Sn=n/2 (2a+(n_1)×d

S38=38/2 (2×17+(38_1)×9

=19×367

=6973

Ans= n=38

Sn=6973