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Why is the sequence (5,10,20,40,\ldots) not an arithmetic progression?

Answer and explanation

Correct answer: Because the differences between consecutive terms are not equal

In an arithmetic progression, the difference between every pair of consecutive terms must be the same. Here, the differences are 10−5=5, 20−10=10, and 40−20=20. Since these differences are unequal, this is not an arithmetic progression. Merely increasing terms do not make a sequence an AP. Exam tip: check the first two or three consecutive differences.

Related tags

Arithmetic ProgressionSequencesCommon DifferenceClass 9 MathematicsNumber PatternsSequences And ProgressionsMathematicsClass 9 Mcq

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