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If (13, 2x+1, 4x-5) are in an arithmetic progression, what is the common difference?

Answer and explanation

Correct answer: No such common difference exists

In an arithmetic progression, the middle term is the average of the first and third terms. Therefore, \(2(2x+1)=13+(4x-5)\) must hold. Simplifying gives \(4x+2=4x+8\), or \(2=8\), which is impossible. Hence, for no value of \(x\) do these three terms form an AP, so no common difference exists. Exam tip: for three terms \(a,b,c\), check an AP quickly using \(2b=a+c\).

Related tags

Arithmetic ProgressionCommon DifferenceAp ConditionClass 10 MathematicsAlgebraic ExpressionsIntroduction To Aps And Common Difference.Introduction To Aps And Common DifferenceArithmetic Progressions (Ap)

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