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What is the difference between the sums of the first (75) and first (50) natural numbers?

Answer and explanation

Correct answer: 1575

The sum of the first \(n\) natural numbers is \(S_n=\frac{n(n+1)}{2}\). Thus, \(S_{75}=\frac{75\times76}{2}=2850\) and \(S_{50}=\frac{50\times51}{2}=1275\). Therefore, the difference is \(2850-1275=1575\). Although 1585 is close, it does not result from the correct subtraction. Exam tip: this difference can also be viewed as the sum of the numbers from \(51\) to \(75\).

Related tags

Natural NumbersSum FormulaArithmetic ProgressionSequencesDifference Of SumsSum Of First N Natural NumbersSequences And ProgressionsMathematics

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