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Class 10MathematicsArithmetic Progressions (AP)Word problems based on APsExpertLevel 70
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In a stage decoration the first row has (96) lights and each next row has (4) fewer lights. How many lights are there in (18) rows?

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Answer and explanation

Correct answer: (1116)

The lights form the decreasing AP (96,92,88,\ldots) and (S_{18}=1116). Exam tip: in decreasing rows the common difference is negative.

Related tags

ApWord-ProblemLightsDecreasing

Frequently asked questions

What is the correct answer to this question?

(1116)

Why is this the correct answer?

The lights form the decreasing AP (96,92,88,\ldots) and (S_{18}=1116). Exam tip: in decreasing rows the common difference is negative.

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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