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If (a_n=3n+4) and (a_m=91), what is (a_{m+12})?

Answer and explanation

Correct answer: 127

Given \(a_n=3n+4\), the common difference of the AP is \(d=3\). Moving 12 terms ahead from \(a_m=91\) increases the value by \(12\times3=36\). Therefore, \(a_{m+12}=91+36=127\). Option 124 would imply an increase of only 33, which is not correct for 12 steps. Exam tip: when the index increases by \(k\), an AP term increases by \(kd\).

Related tags

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

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