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Which of the following explicit rules defines an arithmetic sequence?

Answer and explanation

Correct answer: \(a_n=5-2n\)

For \(a_n=5-2n\), the difference \(a_{n+1}-a_n=-2\) is constant, so it is arithmetic. In option B, the ratio of consecutive terms is constant, making it geometric. Exam tip: an AP rule is usually linear in \(n\), of the form \(pn+q\).

Related tags

Arithmetic ProgressionExplicit FormulaSequence ClassificationNth TermClass 9 MathematicsExplicit Or General RuleSequences And ProgressionsMathematics

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