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If (a_n=8n+q) and (a_{6n}-a_{2n}=384), what is the value of (n)?

Answer and explanation

Correct answer: 12

Given \(a_n=8n+q\), we get \(a_{6n}=8(6n)+q=48n+q\) and \(a_{2n}=8(2n)+q=16n+q\). Hence, \(a_{6n}-a_{2n}=32n\). Therefore, \(32n=384\) gives \(n=12\). The constant \(q\) cancels when the two terms are subtracted. Exam tip: substitute the index carefully into the given term formula before simplifying.

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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