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If (a_n=4n+q) and (a_{3n}-a_n=96), what is the value of (n)?

Answer and explanation

Correct answer: \(12\)

Given \(a_n=4n+q\), we get \(a_{3n}=4(3n)+q=12n+q\). Hence, \(a_{3n}-a_n=(12n+q)-(4n+q)=8n\). Since \(8n=96\), \(n=12\). The constant \(q\) cancels when the two terms are subtracted, so it does not affect the value of \(n\). Exam tip: Substitute \(3n\) for \(n\) carefully before finding the difference.

Related tags

Arithmetic ProgressionNth TermAlgebraic SubstitutionSequence TermsClass 10 MathematicsFinding The $N$Th Term Of An ApFinding The N Th Term Of An ApArithmetic Progressions (Ap)

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