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What is obtained by subtracting the sum of the first (125) natural numbers from the sum of the first (150) natural numbers?

Answer and explanation

Correct answer: 3450

The sum of the first 150 natural numbers is \(\frac{150\times151}{2}=11325\), and the sum of the first 125 natural numbers is \(\frac{125\times126}{2}=7875\). Therefore, the difference is \(11325-7875=3450\). It is also the sum of the numbers from 126 to 150. Although 3425 is close, it does not result from the correct calculation. Exam tip: interpret such a difference as the sum of the remaining consecutive terms.

Related tags

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

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