If 7 times the 7th term of an AP is equal to 11 times its 11th term, then its
18th term will be
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Answer:
18 th term is zero
Step-by-step explanation:
Let a be the first term d be the common diffrence .
A. T. Q.,
7(a+6d) = 11(a+10d)
7a+42d = 11a+110d
42d - 110d = 11a - 7a
- 68d = 4a
a = - 17d ........(1)
18 th term = a+17d
from 1
= -17d +17d = 0
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