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What is the sum of the first (64) natural numbers?

Answer and explanation

Correct answer: 2080

The sum of the first \(n\) natural numbers is \(S_n=\frac{n(n+1)}{2}\). Therefore, \(S_{64}=\frac{64\times65}{2}=32\times65=2080\). Hence, 2080 is correct. The value 2048 may result from using \(64\times32\), but that incorrectly omits the \((n+1)=65\) factor. Exam tip: Write \(n(n+1)/2\) and cancel the even factor with 2 first.

Related tags

MathematicsSequences And ProgressionsNatural NumbersSum FormulaArithmetic SeriesSum Of First N Natural NumbersClass 9 Mcq

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