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Which of the following sequences does not represent the nth term of an arithmetic progression (AP)?

Answer and explanation

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

For \(a_n=3n^2-2\), \(a_1=1,a_2=10,a_3=25\), so the consecutive differences are \(9\) and \(15\), not constant. An AP has a linear nth-term form \(pn+q\). Exam tip: check whether first differences are equal.

Related tags

Arithmetic ProgressionNth TermLinear ExpressionSequence ClassificationCommon DifferenceClass 10 MathematicsFinding The $N$Th Term Of An ApFinding The N Th Term Of An Ap

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