Question

If the 7th term of an Ap is equal to 11/7 times of 1th term then find 18th term​

Answer 1

Step-by-step explanation:

the 7th term is a+6d

the 1th term is a

according to the question

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

7a+42d=11a+110d

a = -17d

then 18th term is a+17d

then putting the value of a in upper equation

then -17d+17d=0

the 18th term is 0