समांतर श्रेणी \(5,13,21,29,\ldots\) के पहले (9) पदों का योग क्या है?
What is the sum of the first (9) terms of the arithmetic progression \(5,13,21,29,\ldots\)?
Explanation opens after your attempt
C. (333)
Concept
The first and ninth terms are (5) and (69), so the sum is (\frac{9(5+69)}{2}=333). Pairing symmetric terms makes calculation quick.
Why this answer is correct
The correct answer is C. (333). The first and ninth terms are (5) and (69), so the sum is (\frac{9(5+69)}{2}=333). Pairing symmetric terms makes calculation quick.
Exam Tip
पहला और नौवाँ पद (5) और (69) हैं, इसलिए योग (\frac{9(5+69)}{2}=333)। सममित जोड़ से गणना तेज होती है।
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