एक गोदाम में पहली कतार में (40) बोरे रखे हैं और हर अगली कतार में (3) बोरे कम हैं। (12) कतारों में कुल कितने बोरे होंगे?
In a warehouse (40) sacks are placed in the first row and (3) fewer sacks in each next row. How many sacks are there in (12) rows?
Explanation opens after your attempt
C. (282)
Concept
The sack numbers are \(40,37,34,\ldots\), and \(S_{12}=282\). Exam tip: keep the common difference negative for decreasing rows.
Why this answer is correct
The correct answer is C. (282). The sack numbers are \(40,37,34,\ldots\), and \(S_{12}=282\). Exam tip: keep the common difference negative for decreasing rows.
Exam Tip
बोरों की संख्या \(40,37,34,\ldots\) है और \(S_{12}=282\)। परीक्षा में घटती पंक्तियों में सार्व अंतर ऋणात्मक रखें।
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