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If (r-9,r-3,r+3,\ldots) is an arithmetic progression, what is (d)?

Answer and explanation

Correct answer: 6

In an arithmetic progression, the common difference is the difference between consecutive terms. Here, \((r-3)-(r-9)=r-3-r+9=6\). Checking the next pair, \((r+3)-(r-3)=6\) as well. Therefore, \(d=6\). Option \(r\) is incorrect because the common difference must not depend on the variable. Exam tip: Find \(d\) by subtracting the first term from the second term.

Related tags

Arithmetic ProgressionCommon DifferenceAlgebraic SequencesClass 10 MathematicsAp BasicsIntroduction To Aps And Common Difference.Introduction To Aps And Common DifferenceArithmetic Progressions (Ap)

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