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What will be the sum of the first (68) natural numbers?

Answer and explanation

Correct answer: 2346

The sum of the first \(n\) natural numbers is \(S_n=\frac{n(n+1)}{2}\). Therefore, \(S_{68}=\frac{68\times69}{2}=34\times69=2346\). Hence, 2346 is correct. A value such as 2356 can result from an error in multiplication or addition. Exam tip: when \(n\) is even, divide \(n\) 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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