Question

If 7 times the 7 ℎ term of an AP is equal to 11 times the 11ℎ term, show that 18ℎ term is zero.

Answer 1

Answer:

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

7a + 42d = 11a + 110d

4a + 68d = 0

4(a+17d) = 0

18th terms is,

(a+17d) which is 0 from above explanation.