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If (p-4, 2p+1, 4p-2) are in an arithmetic progression, what will be the common difference?

Answer and explanation

Correct answer: 13

In an arithmetic progression, the differences between consecutive terms are equal. Therefore,
\((2p+1)-(p-4)=(4p-2)-(2p+1)\).
This gives \(p+5=2p-3\), so \(p=8\). The common difference is then \((2p+1)-(p-4)=17-4=13\). Values such as 15 do not equal the consecutive difference of the given terms. Exam tip: for three terms in an AP, set twice the middle term equal to the sum of the first and third terms.

Related tags

Arithmetic ProgressionCommon DifferenceLinear EquationsClass 10 MathematicsAp TermsIntroduction To Aps And Common Difference.Introduction To Aps And Common DifferenceArithmetic Progressions (Ap)

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