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Class 10MathematicsArithmetic Progressions (AP)Word problems based on APsMediumLevel 70
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In a chair arrangement the first row has (9) chairs and each next row has (3) more chairs. If there are (306) chairs in total then how many rows are there?

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Answer and explanation

Correct answer: (12)

Putting (S_n=306) in the sum formula gives (n=12). Exam tip: you can also check options in the sum formula.

Related tags

ApWord-ProblemArrangement

Frequently asked questions

What is the correct answer to this question?

(12)

Why is this the correct answer?

Putting (S_n=306) in the sum formula gives (n=12). Exam tip: you can also check options in the sum formula.

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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