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If (a_n=5n+q) and (a_{4n}-a_n=135), what is the value of (n)?

Answer and explanation

Correct answer: 9

Given \(a_n=5n+q\), we have \(a_{4n}=5(4n)+q=20n+q\). Hence, \(a_{4n}-a_n=(20n+q)-(5n+q)=15n\). Since \(15n=135\), \(n=9\). Therefore, option C is correct. The constant \(q\) cancels because it occurs in both terms. Exam tip: substitute the given indices into the term formula first, then simplify the difference.

Related tags

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

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