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What will be the (46)th term of the AP \(13,\frac{39}{2},26,\ldots\)?

Answer and explanation

Correct answer: \(\frac{611}{2}\)

The first term is \(a=13\), and the common difference is \(d=\frac{39}{2}-13=\frac{13}{2}\). The \(n\)th term of an AP is \(a_n=a+(n-1)d\). Therefore, \(a_{46}=13+45\times\frac{13}{2}=\frac{26+585}{2}=\frac{611}{2}\). Hence, option B is correct. A nearby option such as \(\frac{599}{2}\) can result from using an incorrect number of differences. Exam tip: always use \(n-1\), not \(n\), in the nth-term formula.

Related tags

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

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