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What is the ratio of the sums of the first (96) and first (72) natural numbers?

Answer and explanation

Correct answer: 194:109

The sum of the first n natural numbers is \(S_n=\frac{n(n+1)}{2}\). Thus, \(S_{96}=\frac{96\times97}{2}=4656\) and \(S_{72}=\frac{72\times73}{2}=2628\). Dividing \(4656:2628\) by 24 gives \(194:109\). The ratio \(96:72\) compares only the numbers of terms, not the sums. Exam tip: when comparing such sums, include both factors \(n\) and \(n+1\).

Related tags

Sequences And ProgressionsNatural NumbersSum FormulaRatioSimplificationSum Of First N Natural NumbersMathematicsClass 9 Mcq

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