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If (a_{3n+2}=148), (a_{n+2}=52), and (d=12), what is (n)?

Answer and explanation

Correct answer: \(4\)

In an AP, \(a_p-a_q=(p-q)d\). Hence, \(a_{3n+2}-a_{n+2}=[(3n+2)-(n+2)]d=2nd\). Therefore, \(148-52=2n\times12\), so \(96=24n\) and \(n=4\). If \(n=3\), the difference would be \(72\), not the given difference \(96\). Exam tip: When two terms are given, first find the difference between their subscripts.

Related tags

Arithmetic ProgressionNth TermCommon DifferenceAlgebraic EquationsClass 10 MathematicsFinding The $N$Th Term Of An ApFinding The N Th Term Of An ApArithmetic Progressions (Ap)

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