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A student added all natural numbers from (1) to (10). What sum will he get?

Answer and explanation

Correct answer: 55

The sum of the first 10 natural numbers is found using \(S_n = \frac{n(n+1)}{2}\). Here, \(n=10\), so \(S_{10}=\frac{10\times11}{2}=55\). Therefore, 55 is correct. The value 45 is the sum from 1 to 9, so it is a close but incorrect option. Exam tip: For the sum from 1 to \(n\), use \(\frac{n(n+1)}{2}\) directly.

Related tags

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

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