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How much is the sum of the first (12) natural numbers?

Answer and explanation

Correct answer: 78

The sum of the first \(n\) natural numbers is \(S_n=\frac{n(n+1)}{2}\). Substituting \(n=12\), \(S_{12}=\frac{12\times13}{2}=6\times13=78\). Therefore, 78 is the correct answer. A value such as 72 may result from using an incorrect multiplication or average. Exam tip: in such questions, use \(n(n+1)/2\) and divide the even factor by 2 before multiplying.

Related tags

Sequences And ProgressionsNatural NumbersSum Of N Natural NumbersArithmetic SeriesClass 9 MathematicsSum Of First N Natural NumbersMathematicsClass 9 Mcq

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