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Class 10MathematicsArithmetic Progressions (AP)Word problems based on APsExpert
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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?

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-ProblemLightsDecreasingWord Problems Based On ApsArithmetic Progressions (Ap)Arithmetic Progressions ApMathematics
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