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What is the sum of natural numbers from (90) to (150)?

Answer and explanation

Correct answer: 7320

There are \(150-90+1=61\) terms from 90 to 150. Using the sum of an arithmetic progression, \(\frac{61}{2}(90+150)=\frac{61}{2}\times240=7320\). Hence, option B is correct. Taking only \(150-90=60\) would miss one endpoint. Exam tip: add \(+1\) when both endpoints are included in the range.

Related tags

Arithmetic ProgressionNatural NumbersSum Of TermsRange SumSequences And ProgressionsSum Of First N Natural NumbersMathematicsClass 9 Mcq

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