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In an AP, if \(a_p=a_q\) for two distinct positive integers p and q, what type of AP must it be?

Answer and explanation

Correct answer: Constant AP

For an AP, \(a_p-a_q=(p-q)d\). Since \(p\ne q\) and \(a_p=a_q\), we get \(d=0\), so every term is equal. Exam tip: equal terms at distinct indices imply zero common difference.

Related tags

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

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