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What is the common difference of the arithmetic progression (a-2,a+1,a+4,a+7,\ldots)?

Answer and explanation

Correct answer: \(3\)

The common difference of an AP is found by subtracting a term from the term immediately after it. Here, \((a+1)-(a-2)=a+1-a+2=3\). Also, \((a+4)-(a+1)=3\), so the common difference is \(3\). \(a+3\) could represent a term, not the difference. Exam tip: When subtracting algebraic expressions, use brackets carefully to handle signs correctly.

Related tags

Arithmetic ProgressionCommon DifferenceClass 10 MathematicsAlgebraic ExpressionsAp IntroductionIntroduction To Aps And Common Difference.Introduction To Aps And Common DifferenceArithmetic Progressions (Ap)

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