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What will be the sum of (1+2+3+\cdots+50)?

Answer and explanation

Correct answer: 1275

The sum of the first \(n\) natural numbers is \(\frac{n(n+1)}{2}\). Here, \(n=50\), so \(\frac{50\times51}{2}=25\times51=1275\). Therefore, the correct answer is 1275. Note that 1225 equals \(\frac{49\times50}{2}\), the sum from 1 to 49. Exam tip: For consecutive natural numbers starting from 1, use \(n(n+1)/2\).

Related tags

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

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