एक सभागार की पहली पंक्ति में (18) सीटें हैं और हर अगली पंक्ति में (3) सीटें अधिक हैं। (20)वीं पंक्ति में कितनी सीटें होंगी?
The first row of an auditorium has (18) seats and each next row has (3) more seats. How many seats are in the (20)th row?
Explanation opens after your attempt
C. (75)
Concept
The seats form an AP and (a_{20}=18+19(3)=75). Exam tip: take the row number as (n) and find the (n)th term.
Why this answer is correct
The correct answer is C. (75). The seats form an AP and (a_{20}=18+19(3)=75). Exam tip: take the row number as (n) and find the (n)th term.
Exam Tip
सीटों की संख्या समान्तर श्रेणी है और (a_{20}=18+19(3)=75)। परीक्षा में पंक्ति संख्या को (n) मानकर (n)वाँ पद निकालें।
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