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What is the general term of the sequence (2,6,22,74,\ldots)?

Answer and explanation

Correct answer: \(a_n=3^n-2n+1\)

Substituting \(n=1,2,3,4\) into \(a_n=3^n-2n+1\) gives \(2,6,22,74\), respectively. Hence, it is the general term. The close distractor \(2^n+n\) gives 3 as its first term, not 2. Exam tip: verify a proposed general term by checking it for at least the first three values of \(n\).

Related tags

SequencesProgressionsExplicit FormulaGeneral TermExponential SequenceClass 9Explicit Or General RuleSequences And Progressions

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