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What is half of the sum of the first (144) natural numbers?

Answer and explanation

Correct answer: 5220

The sum of the first \(n\) natural numbers is \(\frac{n(n+1)}{2}\). Thus, \(S_{144}=\frac{144\times145}{2}=10440\). Half of this sum is \(\frac{10440}{2}=5220\), so option B is correct. \(10440\) is the complete sum, not its half. Exam tip: After finding a sum, carefully apply any extra operation such as “half” or “double.”

Related tags

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

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