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Class 10MathematicsArithmetic Progressions (AP)Word problems based on APsExpertLevel 72
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In a hall the first row has (42) seats and each next row has an equal increase. If (21) rows have (2793) seats in total, what is the increase?

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Answer and explanation

Correct answer: (9)

Using (S_{21}=2793) and (a=42) gives (d=9). Exam tip: find the common difference from total and first term.

Related tags

ApWord-ProblemHallDifference

Frequently asked questions

What is the correct answer to this question?

(9)

Why is this the correct answer?

Using (S_{21}=2793) and (a=42) gives (d=9). Exam tip: find the common difference from total and first term.

Which subject and chapter does this question cover?

This is a Class 10 Mathematics question. Chapter: Arithmetic Progressions (AP). Topic: Word problems based on APs.

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