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Which of the following expressions does not represent the \(n\)th term of an arithmetic progression for every positive integer \(n\)?

Answer and explanation

Correct answer: \(n^2+1\)

The nth term of an AP has the form \(a_n=a+(n-1)d\), so it is linear in \(n\). In \(n^2+1\), consecutive differences are 3, 5, 7, ..., not constant. \(5\) is still an AP with \(d=0\). Exam tip: a squared or cubed \(n\) usually rules out an AP.

Related tags

Arithmetic ProgressionsNth TermLinear ExpressionCommon DifferenceClass 10 MathematicsFinding The $N$Th Term Of An ApFinding The N Th Term Of An ApArithmetic Progressions (Ap)

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