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What is the difference between the sum from (1) to (250) and the sum from (1) to (200)?

Answer and explanation

Correct answer: 11275

Let the sum of the first n natural numbers be \(S_n=\frac{n(n+1)}{2}\). Therefore, \(S_{250}-S_{200}=\frac{250\times251}{2}-\frac{200\times201}{2}=31375-20100=11275\). This difference is the sum of the numbers from 201 to 250. The nearby option 11175 is incorrect because it does not give the correct total of all 50 terms from 201 to 250. Exam tip: Rewrite such a difference directly as \(201+202+\cdots+250\).

Related tags

Sequences And ProgressionsNatural NumbersSum FormulaArithmetic SeriesNumber PatternsSum Of First N Natural NumbersMathematicsClass 9 Mcq

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