Question

If 7 times the 7th term of an AP is equal to 11 times its 11th term, then 18th term will be......​

Answer 1

Step-by-step explanation:

Now, 7th term = a+6d

and, 11th term = a+10d

According to the question,

7(7th term) = 11(11th term)

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

7a+42d = 11a+110d

7a–11a = 110d–42d

–4a = 68d

a = –17d

Now,18th term = a+17d

= –17d+17d = 0

Answer 2

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