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What is the sum of natural numbers from (151) to (210)?

Answer and explanation

Correct answer: 10830

There are \(210-151+1=60\) terms from 151 to 210. Their average is \(\frac{151+210}{2}=180.5\). Hence, the sum is \(60\times180.5=10830\). An option such as 10730 can result from an error in counting the terms or finding the average. Exam tip: when both endpoints are included, always add \(+1\) while counting the terms.

Related tags

Sequences And ProgressionsNatural NumbersArithmetic SeriesSum Of TermsRange SumSum Of First N Natural NumbersMathematicsClass 9 Mcq

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