एक थिएटर की पहली पंक्ति में (18) सीटें हैं और हर अगली पंक्ति में (2) सीटें अधिक हैं। (12)वीं पंक्ति में कितनी सीटें होंगी?
The first row of a theatre has (18) seats and each next row has (2) more seats. How many seats are in the (12)th row?
Explanation opens after your attempt
B. (40)
Concept
The number of seats forms an AP. (a_{12}=18+11(2)=40).
Why this answer is correct
The correct answer is B. (40). The number of seats forms an AP. (a_{12}=18+11(2)=40).
Exam Tip
सीटों की संख्या समान्तर श्रेणी है। (a_{12}=18+11(2)=40)।
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