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What is the sum of natural numbers from (401) to (450)?

Answer and explanation

Correct answer: 21275

There are 50 terms from 401 to 450. Their average is \(\frac{401+450}{2}=425.5\). Therefore, the sum is \(50\times 425.5=21275\). A value such as 21375 can result from a small error in counting terms or finding the average. Exam tip: for an inclusive interval, the number of terms is \(last-first+1\).

Related tags

Arithmetic ProgressionNatural NumbersSum Of SeriesConsecutive IntegersRange SumSum Of First N Natural NumbersSequences And ProgressionsMathematics

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