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Question
If 7 times the seventh term of the AP is equal to 5 times the fifth term, then find the value of its 12th term.
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Solution
7(a + 6d) = 5(a + 4d)
⇒ 2a + 22d = 0
⇒ a + 11d = 0
⇒ t12 = 0
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