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What will be the sum of the first (65) natural numbers?

Answer and explanation

Correct answer: 2145

The sum of the first \(n\) natural numbers is \(S_n=\frac{n(n+1)}{2}\). Therefore, \(S_{65}=\frac{65\times66}{2}=65\times33=2145\). Hence, 2145 is correct. A common mistake is to calculate \(65\times66\) but forget to divide by 2. Exam tip: for the sum of consecutive natural numbers from 1 to \(n\), use \(\frac{n(n+1)}{2}\).

Related tags

Natural NumbersSum FormulaSequences And ProgressionsClass 9 MathematicsArithmetic CalculationSum Of First N Natural NumbersMathematicsClass 9 Mcq

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