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Why is the sequence (1,4,9,16,\ldots) not an arithmetic progression?

Answer and explanation

Correct answer: The differences between consecutive terms are not equal

The consecutive differences in this sequence are \(4-1=3\), \(9-4=5\), and \(16-9=7\). Since these differences are not equal, the sequence is not an arithmetic progression. An arithmetic progression need not begin with zero, and its terms do not all have to be positive. Exam tip: subtract each term from the next one; the sequence is an AP only when every consecutive difference is the same.

Related tags

Arithmetic ProgressionSequencesCommon DifferenceClass 9 MathematicsNumber PatternsSequences And ProgressionsMathematicsClass 9 Mcq

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