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The AP of multiples of (37) greater than (1500) is (1517,1554,1591,\ldots). What will be its (31)st term?

Answer and explanation

Correct answer: 2627

The first term of the AP is \(a=1517\), and its common difference is \(d=1554-1517=37\). The \(n\)th term of an AP is \(a_n=a+(n-1)d\). Hence, \(a_{31}=1517+(31-1)\times37=1517+1110=2627\). Therefore, option B is correct. Using \(2609\) results from an incorrect term count or from not using \((n-1)\). Exam tip: always use \(n-1\), not \(n\), in the nth-term formula.

Related tags

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

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