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Which of the following conditions is necessary and sufficient to identify a sequence as an arithmetic progression (AP) from its nth term \(a_n\)?

Answer and explanation

Correct answer: \(a_{n+1}-a_n\) is the same constant for every positive integer \(n\)

In an AP, the difference of consecutive terms is the common difference \(d\), so \(a_{n+1}-a_n=d\) must be constant. A constant ratio instead identifies a GP. Exam tip: subtract two consecutive nth-term expressions to test for an AP.

Related tags

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

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