एक थिएटर में पहली पंक्ति में (14) सीटें हैं और हर अगली पंक्ति में (4) सीटें अधिक हैं। (10) पंक्तियों में कुल कितनी सीटें होंगी?
In a theatre the first row has (14) seats and each next row has (4) more seats. How many seats are there in (10) rows?
Explanation opens after your attempt
B. (320)
Concept
The seats form the AP \(14,18,22,\ldots\). \(S_{10}=320\).
Why this answer is correct
The correct answer is B. (320). The seats form the AP \(14,18,22,\ldots\). \(S_{10}=320\).
Exam Tip
सीटें \(14,18,22,\ldots\) समान्तर श्रेणी हैं। \(S_{10}=320\)।
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