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A student says that the sequence 2, 5, 9, 12 is an arithmetic progression (AP) because its terms are increasing. Which statement correctly identifies the error in the student's reasoning?

Answer and explanation

Correct answer: The differences between consecutive terms are 3, 4, 3; therefore, it is not an AP.

In an AP, the difference between every pair of consecutive terms must be the same. Here, 5−2=3, 9−5=4, and 12−9=3, so the sequence is not an AP. Exam tip: check consecutive differences first.

Related tags

Arithmetic ProgressionCommon DifferenceSequence AnalysisMisconceptionClass 10 MathematicsIntroduction To Aps And Common Difference.Introduction To Aps And Common DifferenceArithmetic Progressions (Ap)

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