समांतर श्रेणी \(1,6,11,16,\ldots\) के पहले (9) पदों का योग क्या है?
What is the sum of the first (9) terms of the arithmetic progression \(1,6,11,16,\ldots\)?
Explanation opens after your attempt
B. (189)
Concept
The first and ninth terms are (1) and (41), so the sum is (\frac{9(1+41)}{2}=189). Use the first and last terms for the sum.
Why this answer is correct
The correct answer is B. (189). The first and ninth terms are (1) and (41), so the sum is (\frac{9(1+41)}{2}=189). Use the first and last terms for the sum.
Exam Tip
पहला और नौवाँ पद (1) और (41) हैं, इसलिए योग (\frac{9(1+41)}{2}=189)। योग में पहला और अंतिम पद उपयोग करें।
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