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The AP of multiples of (23) greater than (900) is (920,943,966,\ldots). What will be its (27)th term?

Answer and explanation

Correct answer: 1518

The first term is \(a=920\), and the common difference is \(d=943-920=23\). The \(n\)th term of an AP is \(a_n=a+(n-1)d\). Therefore, \(a_{27}=920+(27-1)\times23=920+598=1518\). The value 1541 results from incorrectly using \(n\) instead of \((n-1)\). Exam tip: there are always \(n-1\) common differences between the first term and the \(n\)th term.

Related tags

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

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