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Which of the following sequences has constant second differences for all terms?

Answer and explanation

Correct answer: \(2n^2+3n\)

\(2n^2+3n\) is a quadratic rule, so its first differences are linear and its second differences are constant. For \(5n-1\), the first differences themselves are constant. Exam tip: constant second differences indicate a quadratic sequence.

Related tags

SequencesProgressionsExplicit RuleQuadratic SequenceFinite DifferencesClass 9 MathematicsExplicit Or General RuleSequences And Progressions

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