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If the sum of the first (n) natural numbers is (325), what will (n) be?

Answer and explanation

Correct answer: 25

The sum of the first \(n\) natural numbers is \(\frac{n(n+1)}{2}\). Thus, \(\frac{n(n+1)}{2}=325\), so \(n(n+1)=650\). Since \(25\times 26=650\), \(n=25\). For \(n=24\), the sum is \(\frac{24\times25}{2}=300\), not 325. Exam tip: check for two consecutive factors of twice the given sum.

Related tags

MathematicsSequences And ProgressionsNatural NumbersSum Of Natural NumbersQuadratic EquationSum Of First N Natural NumbersClass 9 Mcq

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