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What will be the total sum of numbers from (1) to (65)?

Answer and explanation

Correct answer: 2145

The sum of the first \(n\) natural numbers is \(\frac{n(n+1)}{2}\). Here, \(n=65\), so \(\frac{65\times66}{2}=65\times33=2145\). Therefore, the correct answer is 2145. A value such as 2112 can result from using 65 or 66 incorrectly in the calculation. Exam tip: for a sum ending at \(n\), 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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