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Class 10MathematicsArithmetic Progressions (AP)Word problems based on APsMedium
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In a stair-like decoration the bottom row has (72) bulbs and each upper row has (6) fewer bulbs. How many bulbs are in the (10)th row?

Answer and explanation

Correct answer: (18)

The bulb numbers are (72,66,60,\ldots) and (a_{10}=18). Exam tip: keep the difference negative when moving upward.

Related tags

ApWord-ProblemDecreasing-PatternWord Problems Based On ApsArithmetic Progressions (Ap)Arithmetic Progressions ApMathematicsClass 10 Mcq
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