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A student solves (1) question on the first day and (1) more question each next day for (24) days. How many questions are solved in total?

Answer and explanation

Correct answer: 300

The numbers of questions solved each day are 1, 2, 3, ..., 24. Therefore, the required total is the sum of the first 24 natural numbers: \(S=\frac{24\times25}{2}=300\). Hence, 300 is correct. Values such as 288 or 324 can result from an incorrect calculation of the sum formula. Exam tip: the sum of the first \(n\) natural numbers is \(\frac{n(n+1)}{2}\).

Related tags

MathematicsSequences And ProgressionsNatural NumbersArithmetic ProgressionSum FormulaSum Of First N Natural NumbersClass 9 Mcq

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