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If p and q are constants, which of the following forms of the nth term guarantees that the sequence is an arithmetic progression?

Answer and explanation

Correct answer: \(a_n=pn+q\)

For \(a_n=pn+q\), \(a_{n+1}-a_n=[p(n+1)+q]-(pn+q)=p\), a constant. Hence it is an AP. In \(pn^2+q\), the difference changes with n. Exam tip: a linear nth-term form indicates an AP.

Related tags

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

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