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Find the sum of the first (55) natural numbers.

Answer and explanation

Correct answer: 1540

The sum of the first \(n\) natural numbers is \(S_n=\frac{n(n+1)}{2}\). Therefore, \(S_{55}=\frac{55\times56}{2}=55\times28=1540\). Hence, 1540 is the correct option. The value \(1485\) is the sum up to 54, since \(\frac{54\times55}{2}=1485\). Exam tip: divide the even factor by 2 first to calculate quickly.

Related tags

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

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