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For which (a) is (a+4, 2a+1, 5a-8) an arithmetic progression?

Answer and explanation

Correct answer: 3

In an arithmetic progression, the differences between consecutive terms are equal. Here, the first difference is \((2a+1)-(a+4)=a-3\), and the second difference is \((5a-8)-(2a+1)=3a-9\). Thus, \(a-3=3a-9\), which gives \(a=3\). Therefore, option 3 is correct. Exam tip: For three terms to be an AP, equate the first and second differences.

Related tags

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

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