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Find the sum of the first (47) natural numbers.

Answer and explanation

Correct answer: 1128

The sum of the first \(n\) natural numbers is \(S_n=\frac{n(n+1)}{2}\). Therefore, \(S_{47}=\frac{47\times48}{2}=47\times24=1128\). Hence, option B is correct. Dividing \(48\) by \(2\) first makes the calculation simpler than multiplying \(47\times48\) directly. Exam tip: use \(n(n+1)/2\) for the sum of the first \(n\) natural numbers.

Related tags

Sequences And ProgressionsNatural NumbersSum Of Natural NumbersArithmetic SeriesFormula ApplicationSum Of First N Natural NumbersMathematicsClass 9 Mcq

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