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In a hospital (18) patients come on the first day and (2) more patients come each next day. How many patients come in (9) days?

Answer and explanation

Correct answer: 234

The daily number of patients forms an arithmetic progression: \(18, 20, 22, \ldots\). Here, \(a=18\), \(d=2\), and \(n=9\). Therefore, \(S_9=\frac{9}{2}[2(18)+(9-1)2]=\frac{9}{2}(52)=234\). Hence, 234 is correct. An answer such as 230 may result from using the wrong number of terms or making an error in the sum formula. Exam tip: identify \(a\), \(d\), and \(n\) before applying the AP formula.

Related tags

Arithmetic ProgressionAp Word ProblemsSum Of ApClass 10 MathematicsWord Problems Based On ApsArithmetic Progressions (Ap)Arithmetic Progressions ApMathematics

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