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Which formula correctly represents the sum of the first n natural numbers?

Answer and explanation

Correct answer: \(\frac{n(n+1)}{2}\)

The sum \(1+2+3+\cdots+n\) is given by \(\frac{n(n+1)}{2}\). The expression \(\frac{n(n+1)(2n+1)}{6}\) is for the sum of squares. Exam tip: identify the sequence before selecting a formula.

Related tags

Natural NumbersSum FormulaSequencesProgressionsAlgebraic FormulasSum Of First N Natural NumbersSequences And ProgressionsMathematics

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