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What is the difference between the sum of the first (175) natural numbers and the sum of the first (125) natural numbers?

Answer and explanation

Correct answer: 7525

The sum of the first 175 natural numbers is \\(S_{175}=\frac{175\times176}{2}=15400\\), while the sum of the first 125 natural numbers is \\(S_{125}=\frac{125\times126}{2}=7875\\). Therefore, the difference is \\(15400-7875=7525\\). This is also the sum of the numbers from 126 to 175; 7475 results from an arithmetic error in subtraction. Exam tip: use \\(S_n=\frac{n(n+1)}{2}\\) for each sum and then subtract.

Related tags

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

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