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In the AP (17,24,31,\ldots), (a_n=136). Find the value of (n).

Answer and explanation

Correct answer: 18

Here, the first term is \(a=17\) and the common difference is \(d=24-17=7\). The \(n\)th term is given by \(a_n=a+(n-1)d\). Thus, \(136=17+(n-1)\times7\), so \(119=7(n-1)\). Hence, \(n-1=17\) and \(n=18\). Option 17 is incorrect because the 17th term is \(129\). Exam tip: always use \((n-1)\), not \(n\), in the AP nth-term formula.

Related tags

Arithmetic ProgressionNth TermTerm NumberAp FormulaClass 10 MathematicsFinding The $N$Th Term Of An ApFinding The N Th Term Of An ApArithmetic Progressions (Ap)

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