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For the sequence \(3,\, 3+r,\, 3+2r,\, 3+3r,\ldots\), what is the common difference?

Answer and explanation

Correct answer: \(r\)

In an arithmetic progression, the common difference is the amount added to one term to get the next term. Here, from \(3\) to \(3+r\) the increase is \((3+r)-3=r\). The same holds for the next step: \((3+2r)-(3+r)=r\). So the common difference is \(r\). Hence option B is correct.

Related tags

Arithmetic ProgressionCommon DifferenceApAlgebraic Form

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