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A student read 12, 15, 18, and 21 pages on four consecutive days. The student claims that this forms an arithmetic progression (AP). What is the correct evaluation of the claim?

Answer and explanation

Correct answer: The claim is correct; the common difference is 3.

The consecutive differences are 15−12=3, 18−15=3, and 21−18=3. Since all differences are equal, it is an AP with common difference 3. Exam tip: compare consecutive terms first.

Related tags

Arithmetic ProgressionCommon DifferenceAp IntroductionSequence AnalysisClass 10 MathematicsIntroduction To Aps And Common Difference.Introduction To Aps And Common DifferenceArithmetic Progressions (Ap)

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