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What type of function of n is the sum of the first n natural numbers?

Answer and explanation

Correct answer: Quadratic function

The sum is \(S_n=\frac{n(n+1)}{2}\). Writing it as \(\frac{n^2+n}{2}\) shows that the highest power of n is 2, so it is a quadratic function. A linear function has highest power 1. Exam tip: expand the formula and check the highest power.

Related tags

Natural NumbersSum FormulaQuadratic FunctionSequences And ProgressionsClass 9 MathematicsSum Of First N Natural NumbersMathematicsClass 9 Mcq

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