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In an office, (3) new employees join in the first month and (2) more employees join each next month. How many employees join in (12) months?

Answer and explanation

Correct answer: 168

The monthly numbers of new employees form an arithmetic progression: \(3, 5, 7, \ldots\). Here, \(a=3\), \(d=2\), and \(n=12\). Therefore, \(S_{12}=\frac{12}{2}[2(3)+(12-1)\times2]=6(28)=168\). Hence, 168 is the correct answer. A value such as 170 can result from an error in counting the terms or using the common difference. Exam tip: In AP word problems, first identify \(a\), \(d\), and \(n\), then apply the formula for \(S_n\).

Related tags

Arithmetic ProgressionAp Word ProblemsSum Of N TermsClass 10 MathematicsSequence ApplicationsWord Problems Based On ApsArithmetic Progressions (Ap)Arithmetic Progressions Ap

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