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If (6, h, 30) are in an arithmetic progression, which pair of (h) and common difference is correct?

Answer and explanation

Correct answer: \(h=18,\ d=12\)

For three terms in an arithmetic progression, the middle term is the average of the first and third terms. Thus, \(h=\frac{6+30}{2}=18\). Hence the common difference is \(d=18-6=12\), and also \(30-18=12\). In option A, the two consecutive differences are not equal. Exam tip: For a three-term AP, quickly find the middle term by averaging the first and third terms.

Related tags

Arithmetic ProgressionCommon DifferenceThree Term ApClass 10 MathematicsAp Middle TermIntroduction To Aps And Common Difference.Introduction To Aps And Common DifferenceArithmetic Progressions (Ap)

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