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Which of the following sets represents numbers obtained as the sum of the first n natural numbers (triangular numbers)?

Answer and explanation

Correct answer: \(\left\{\frac{n(n+1)}{2}:n\in\mathbb{N},\ n\geq1\right\}\)

The sum of the first n natural numbers is \(S_n=\frac{n(n+1)}{2}\), so option A gives the set of triangular numbers. For example, \(n=3\) gives 6. Squares form a different set. In exams, identify the standard sum formula before choosing.

Related tags

Natural NumbersTriangular NumbersSequence And ProgressionSum FormulaNumber PatternsSum Of First N Natural NumbersSequences And ProgressionsMathematics

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