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If the first four terms of a sequence are (5,12,19,26), what can be a simple rule for (a_n)?

Answer and explanation

Correct answer: \(a_n=7n-2\)

The difference between consecutive terms is 7, so this is an arithmetic sequence. Its nth term is \(a_n=a_1+(n-1)d=5+(n-1)\times7=7n-2\). For \(a_n=7n+5\), substituting \(n=1\) gives 12, not the first term 5. Exam tip: check a proposed rule by substituting \(n=1\) for the first term.

Related tags

SequencesArithmetic ProgressionNth TermLinear RuleGrade 9 MathematicsSequences And ProgressionsMathematicsClass 9 Mcq

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