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What is obtained by subtracting the sum of the first (23) natural numbers from the sum of the first (41) natural numbers?

Answer and explanation

Correct answer: 585

The sum of the first n natural numbers is \(S_n=\frac{n(n+1)}{2}\). Thus, \(S_{41}=\frac{41\times42}{2}=861\) and \(S_{23}=\frac{23\times24}{2}=276\). Therefore, \(S_{41}-S_{23}=861-276=585\). This is also the sum of the natural numbers from 24 to 41. Option 575 is only a nearby value, not the correct difference. Exam tip: You may also directly find the sum from 24 to 41 in such questions.

Related tags

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

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