समांतर श्रेढ़ी \(10,15,20,\ldots\) के पहले (8) पदों का योग क्या है?
What is the sum of the first (8) terms of the arithmetic progression \(10,15,20,\ldots\)?
Explanation opens after your attempt
B. (220)
Concept
Here (a=10), (d=5), and (n=8), so the sum is (220). For small (n), you can also check by finding the last term.
Why this answer is correct
The correct answer is B. (220). Here (a=10), (d=5), and (n=8), so the sum is (220). For small (n), you can also check by finding the last term.
Exam Tip
यहाँ (a=10), (d=5), (n=8) है, इसलिए योग (220) है। छोटे (n) में अंतिम पद निकालकर भी जाँच सकते हैं।
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