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If every set of three consecutive terms of a sequence is \(p, q, r\), which relation is necessary and sufficient for it to be an arithmetic progression?

Answer and explanation

Correct answer: \(2q=p+r\)

In an AP, consecutive differences are equal: \(q-p=r-q\). Rearranging gives \(2q=p+r\), so the middle term is the average of the outer terms. \(q^2=pr\) is the corresponding condition for a GP. Exam tip: check the average-middle-term property quickly.

Related tags

Arithmetic ProgressionSequencesAp PropertyMiddle TermClass 9 MathematicsSequences And ProgressionsMathematicsClass 9 Mcq

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