समांतर श्रेढ़ी \(2,9,16,\ldots\) के पहले कितने पदों का योग पहली बार (1000) से अधिक होगा?
For the AP \(2,9,16,\ldots\), after how many first terms will the sum exceed (1000) for the first time?
Explanation opens after your attempt
D. (18)
Concept
\(S_{17}=986\) and \(S_{18}=1107\), so the sum first exceeds (1000) at (18) terms. In such questions, also check the previous sum.
Why this answer is correct
The correct answer is D. (18). \(S_{17}=986\) and \(S_{18}=1107\), so the sum first exceeds (1000) at (18) terms. In such questions, also check the previous sum.
Exam Tip
\(S_{17}=986\) और \(S_{18}=1107\), इसलिए पहली बार (18) पदों पर योग (1000) से अधिक है। ऐसे प्रश्न में पिछले योग की भी जाँच करें।
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