Question

if 7times 7th term of an ap is equal to 11 time its 11th term ,find its 18th term

Answer 1

Answer:

7(a+6d)=11(a+10d)

7a+42d=11a+110d

7a-11a=110d-42d

-4a =68d

a=-68/4d

a=-17d

a+17d=0

a18=0

It's 18th term is 0

Hope it helps you.

Answer 2

Here is your step by step answer with explanations