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Which of the following statements about the sum of the first n natural numbers is correct?

Answer and explanation

Correct answer: It is half the product of two consecutive integers.

The sum of the first n natural numbers is \(1+2+\cdots+n=\frac{n(n+1)}{2}\), half the product of consecutive integers n and \(n+1\). It is not always even: for n=2, the sum is 3. Exam tip: check the \(n+1\) factor carefully.

Related tags

Natural NumbersSum FormulaSequencesProgressionsNumber PropertiesSum Of First N Natural NumbersSequences And ProgressionsMathematics

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