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What is the sum of natural numbers from (50) to (150)?

Answer and explanation

Correct answer: 10100

There are
\(150-50+1=101\) terms from 50 to 150, including both endpoints. Their average is
\(\frac{50+150}{2}=100\). Hence, the sum is
\(101\times100=10100\). The option 10050 results from an error in counting the inclusive terms or finding the average. Exam tip: for an inclusive range from \(a\) to \(b\), use \(b-a+1\) for the number of terms.

Related tags

Sequences And ProgressionsArithmetic ProgressionSum Of Natural NumbersInclusive RangeSeries FormulaSum Of First N Natural NumbersMathematicsClass 9 Mcq

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