समांतर श्रेढ़ी \(40,37,34,\ldots\) के पहले (10) पदों का योग ज्ञात कीजिए।
Find the sum of the first (10) terms of the arithmetic progression \(40,37,34,\ldots\).
Explanation opens after your attempt
A. (265)
Concept
The tenth term is (13), so (S_{10}=\frac{10}{2}(40+13)=265). In a decreasing progression, the last term is smaller.
Why this answer is correct
The correct answer is A. (265). The tenth term is (13), so (S_{10}=\frac{10}{2}(40+13)=265). In a decreasing progression, the last term is smaller.
Exam Tip
दसवाँ पद (13) है, इसलिए (S_{10}=\frac{10}{2}(40+13)=265)। घटती श्रेढ़ी में अंतिम पद कम होता है।
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