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How much is the sum of natural numbers from (201) to (250)?

Answer and explanation

Correct answer: (11275)

To add consecutive natural numbers from 201 to 250, use the sum formula for an initial segment and subtract the numbers up to 200. The formula is \\(S_n=\frac{n(n+1)}{2}\\). Subtracting \\(S_{200}\\) removes 1 through 200 and leaves exactly 201 through 250, so no endpoint is missed.

Calculate \\(S_{250}=\frac{250\times251}{2}=31375\\), and \\(S_{200}=\frac{200\times201}{2}=20100\\). Therefore, the required sum is \\(S_{250}-S_{200}=31375-20100=11275\\). A quick check uses 50 terms with average \\(\frac{201+250}{2}=225.5\\), giving \\(50\times225.5=11275\\). Hence option A is correct.

Related tags

SequencesProgressionsNatural-NumbersRange-Sum

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