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In a hospital, (10) patients come on the first day and (2) more patients come each next day. How many patients come in (12) days?

Answer and explanation

Correct answer: 252

The daily patient counts form an arithmetic progression: 10, 12, 14, \ldots. Here, \(a=10\), \(d=2\), and \(n=12\). Therefore, \(S_{12}=\frac{12}{2}[2(10)+11(2)]=6(42)=252\). Hence, the correct answer is 252. The value 264 is the number of patients on the 12th day, \(a_{12}\), not the total over 12 days. Exam tip: distinguish between \(a_n\) for one term and \(S_n\) for the sum of terms.

Related tags

Arithmetic ProgressionAp Word ProblemsSum Of ApClass 10 MathematicsNth TermWord Problems Based On ApsArithmetic Progressions (Ap)Arithmetic Progressions Ap

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