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The \(n\)th term of a sequence is \(a_n=4n-7\). What is the most appropriate reason for identifying it as an arithmetic progression (AP)?

Answer and explanation

Correct answer: For every \(n\), \(a_{n+1}-a_n=4\), which is constant.

\(a_{n+1}-a_n=[4(n+1)-7]-(4n-7)=4\). A sequence is an AP only when consecutive terms have a constant difference. A negative first term does not prove this. Exam tip: test \(a_{n+1}-a_n\).

Related tags

Arithmetic ProgressionNth TermCommon DifferenceSequence ClassificationLinear SequenceFinding The $N$Th Term Of An ApFinding The N Th Term Of An ApArithmetic Progressions (Ap)

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