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What is the sum of natural numbers from (1) to (42)?

Answer and explanation

Correct answer: 903

The sum of the first \(n\) natural numbers is \(\frac{n(n+1)}{2}\). Therefore, the sum from \(1\) to \(42\) is \(\frac{42\times43}{2}=21\times43=903\). A value such as \(893\) can result from an error in multiplication or division. Exam tip: for consecutive natural numbers starting from \(1\), directly use \(\frac{n(n+1)}{2}\).

Related tags

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

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