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Which condition is necessary and sufficient for four numbers \,p, q, r, s\, in this order to be consecutive terms of an arithmetic progression?

Answer and explanation

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

From \(p+r=2q\), we get \(q-p=r-q\); from \(q+s=2r\), we get \(r-q=s-r\). Thus all consecutive differences are equal. Option B alone is insufficient. Exam tip: compare consecutive differences.

Related tags

Arithmetic ProgressionCommon DifferenceAp PropertiesConsecutive TermsAlgebraic ConditionsIntroduction To Aps And Common Difference.Introduction To Aps And Common DifferenceArithmetic Progressions (Ap)

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