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Why is \(n(n+1)\) always even in the formula \(S_n=\frac{n(n+1)}{2}\) for the sum of the first \(n\) natural numbers?

Answer and explanation

Correct answer: Because \(n\) and \(n+1\) are consecutive integers, and one of them is always even.

\(n\) and \(n+1\) are consecutive integers. One consecutive integer is even and the other is odd, so their product is even and can be divided by 2. Exam tip: remember the even-odd pattern of consecutive integers.

Related tags

Natural NumbersSum FormulaConsecutive IntegersEven NumbersSequences And ProgressionsNumber PropertiesSum Of First N Natural NumbersMathematics

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