एक थिएटर की पहली पंक्ति में (18) सीटें हैं और हर अगली पंक्ति में (2) सीटें अधिक हैं। (20)वीं पंक्ति में कितनी सीटें होंगी?

A theatre has (18) seats in the first row and each next row has (2) more seats. How many seats are in the (20)th row?

Explanation opens after your attempt
Correct Answer

B. (56)

Step 1

Concept

\(a_{20}=18+19\times2=56\). For row number (20), the difference is added (19) times.

Step 2

Why this answer is correct

The correct answer is B. (56). \(a_{20}=18+19\times2=56\). For row number (20), the difference is added (19) times.

Step 3

Exam Tip

\(a_{20}=18+19\times2=56\)। पंक्ति संख्या (20) होने पर अंतर (19) बार जुड़ता है।

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Mathematics Answer, Explanation and Revision Hints

एक थिएटर की पहली पंक्ति में (18) सीटें हैं और हर अगली पंक्ति में (2) सीटें अधिक हैं। (20)वीं पंक्ति में कितनी सीटें होंगी? / A theatre has (18) seats in the first row and each next row has (2) more seats. How many seats are in the (20)th row?

Correct Answer: B. (56). Explanation: \(a_{20}=18+19\times2=56\)। पंक्ति संख्या (20) होने पर अंतर (19) बार जुड़ता है। / \(a_{20}=18+19\times2=56\). For row number (20), the difference is added (19) times.

Which concept should I revise for this Mathematics MCQ?

\(a_{20}=18+19\times2=56\). For row number (20), the difference is added (19) times.

What exam hint can help solve this Mathematics question?

\(a_{20}=18+19\times2=56\)। पंक्ति संख्या (20) होने पर अंतर (19) बार जुड़ता है।