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Which of the following expressions for \(a_n\), for every natural number \(n\), can represent the nth term of an arithmetic progression?

Answer and explanation

Correct answer: \(a_n=4n-7\)

For option A, \(a_{n+1}-a_n=[4(n+1)-7]-(4n-7)=4\), which is constant, so it is an AP. For \(n^2-7\), the difference \(2n+1\) varies. Exam tip: \(pn+q\) form gives an AP.

Related tags

Arithmetic ProgressionNth TermSequence ClassificationCommon DifferenceLinear ExpressionFinding The $N$Th Term Of An ApFinding The N Th Term Of An ApArithmetic Progressions (Ap)

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