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
Correct Answer

C. (75)

Step 1

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.

Step 2

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.

Step 3

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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Mathematics Answer, Explanation and Revision Hints

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?

Correct Answer: C. (75). Explanation: सीटों की संख्या समान्तर श्रेणी है और (a_{20}=18+19(3)=75)। परीक्षा में पंक्ति संख्या को (n) मानकर (n)वाँ पद निकालें। / 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.

Which concept should I revise for this Mathematics MCQ?

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.

What exam hint can help solve this Mathematics question?

सीटों की संख्या समान्तर श्रेणी है और (a_{20}=18+19(3)=75)। परीक्षा में पंक्ति संख्या को (n) मानकर (n)वाँ पद निकालें।