एक सभागार की पहली पंक्ति में (24) कुर्सियां हैं और हर अगली पंक्ति में (3) कुर्सियां अधिक हैं। (16)वीं पंक्ति में कितनी कुर्सियां होंगी?
An auditorium has (24) chairs in the first row and each next row has (3) more chairs. How many chairs are in the (16)th row?
Explanation opens after your attempt
B. (69)
Concept
\(a_{16}=24+15\times3=69\). Up to the (16)th row, the difference is added (15) times.
Why this answer is correct
The correct answer is B. (69). \(a_{16}=24+15\times3=69\). Up to the (16)th row, the difference is added (15) times.
Exam Tip
\(a_{16}=24+15\times3=69\)। (16)वीं पंक्ति तक अंतर (15) बार जुड़ता है।
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