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What is the sum of the first (48) natural numbers?

Answer and explanation

Correct answer: (1176)

The direct answer is option A, \(1176\). The first 48 natural numbers are \(1,2,\ldots,48\). Their sum is \(S_n=\frac{n(n+1)}2\). Substituting \(n=48\), \(S_{48}=\frac{48\times49}{2}=24\times49=1176\). Option A is correct. Option B, 1128, is too small and does not follow from the formula. Option C, 1224, is too large and usually comes from incorrect multiplication. Option D, 1152, may result from forgetting the \(+1\) or using an incomplete calculation. Natural numbers here begin at 1, so zero is not included. Exam cue: for the first \(n\) natural numbers, use \(n(n+1)/2\), and divide the even factor first.

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MathSequencesNatural-NumbersSum

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