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If (14, 14-d, 14-2d, 14-3d) is an arithmetic progression, what is the common difference?

Answer and explanation

Correct answer: \(-d\)

The common difference of an arithmetic progression is obtained by subtracting a term from the next term. Here, \((14-d)-14=-d\). Also, \((14-2d)-(14-d)=-d\), so the common difference is \(-d\). Although the terms decrease by \(d\), the difference must carry a negative sign. Exam tip: always calculate common difference as next term minus previous term.

Related tags

Arithmetic ProgressionCommon DifferenceAlgebraic ExpressionsClass 10 MathematicsSequence And SeriesIntroduction To Aps And Common Difference.Introduction To Aps And Common DifferenceArithmetic Progressions (Ap)

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