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In class, numbers from (1) to (31) were written and their sum was asked. What is the correct answer?

Answer and explanation

Correct answer: 496

The sum of natural numbers from 1 to \(n\) is \(\frac{n(n+1)}{2}\). Here, \(n=31\), so \(\frac{31\times 32}{2}=31\times 16=496\). Therefore, 496 is correct. The value 465 is the sum from 1 to 30, so it is a close but incorrect distractor. Exam tip: use the last number in the series as \(n\).

Related tags

Sequences And ProgressionsNatural NumbersSum FormulaArithmetic SeriesClass 9Sum Of First N Natural NumbersMathematicsClass 9 Mcq

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