एक सभागार की पहली पंक्ति में (30) सीटें हैं और हर अगली पंक्ति में (6) सीटें अधिक हैं। (18) पंक्तियों में कुल कितनी सीटें होंगी?
An auditorium has (30) seats in the first row and (6) more seats in each next row. How many seats are there in (18) rows?
Explanation opens after your attempt
B. (1458)
Concept
The seats form the AP \(30,36,42,\ldots\), and \(S_{18}=1458\). Exam tip: convert row arrangements into APs.
Why this answer is correct
The correct answer is B. (1458). The seats form the AP \(30,36,42,\ldots\), and \(S_{18}=1458\). Exam tip: convert row arrangements into APs.
Exam Tip
सीटें \(30,36,42,\ldots\) समान्तर श्रेणी हैं और \(S_{18}=1458\)। परीक्षा में पंक्ति व्यवस्था को ए.पी. में बदलें।
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