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A student claims that the sequence 4, 9, 14, 20 is an arithmetic progression because its terms are increasing. What is the student’s error?

Answer and explanation

Correct answer: The differences between consecutive terms are 5, 5 and 6, which are not equal.

In an AP, the difference between every pair of consecutive terms must be constant. Here, 9−4=5 and 14−9=5, but 20−14=6. So it is not an AP. Exam tip: check all consecutive differences.

Related tags

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

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