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Question
Which term of the AP 25, 20, 15, ... is the first negative term?
Options
10th
9th
8th
7th
MCQ
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Solution
7th
Explanation:
Let Tn < 0.
Then, 25 + (n – 1) × (–5) < 0.
∴ 30 < 5n
⇒ 5n > 30
⇒ n > 6
So, the required term is 7th.
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