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What is the sum of natural numbers from (75) to (125)?

Answer and explanation

Correct answer: 5100

There are \(125-75+1=51\) terms from 75 to 125. Their average is \(\frac{75+125}{2}=100\). Therefore, the sum is \(51\times100=5100\). A value such as 5150 can result from an error in counting the terms or finding the average. Exam tip: Always add \(+1\) when counting terms in an inclusive range.

Related tags

Arithmetic ProgressionSum Of Natural NumbersInclusive RangeSequences And ProgressionsClass 9 MathematicsSum Of First N Natural NumbersMathematicsClass 9 Mcq

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