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What is half of the sum of the first (40) natural numbers?

Answer and explanation

Correct answer: 410

The sum of the first 40 natural numbers is \\(S=\frac{40\times41}{2}=820\\). Half of this sum is \\(\frac{820}{2}=410\\), so option B is correct. Getting 420 would result from an error while finding the sum or taking half of it. Exam tip: remember that the sum of the first n natural numbers is \\(\frac{n(n+1)}{2}\\).

Related tags

MathematicsSequences And ProgressionsNatural NumbersSum Of N Natural NumbersArithmetic CalculationSum Of First N Natural NumbersClass 9 Mcq

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