समांतर श्रेणी \(2,8,14,20,\ldots\) के पहले (7) पदों का योग क्या है?
What is the sum of the first (7) terms of the arithmetic progression \(2,8,14,20,\ldots\)?
Explanation opens after your attempt
C. (140)
Concept
The first (7) terms are (2,8,14,20,26,32,38), and their sum is (140). Pairing symmetric terms makes calculation faster.
Why this answer is correct
The correct answer is C. (140). The first (7) terms are (2,8,14,20,26,32,38), and their sum is (140). Pairing symmetric terms makes calculation faster.
Exam Tip
पहले (7) पद (2,8,14,20,26,32,38) हैं और योग (140) है। सममित जोड़ से गणना तेज होती है।
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