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If 7 times the 7^th term of an AP is equal to 11 times its 11^th term, then find its 18^th term.

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answer is B.

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Detailed Solution

According to the given condition
7(a + 6d) = 11(a + 100)

or, 7a + 42d = 11a + 110d

or, 4a + 68d = 0

or, a + 17d = 0

Now, a₁₈ = a + 17d = 0

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