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What is the sum of (16+17+18+\cdots+25)?

Answer and explanation

Correct answer: 205

These are 10 consecutive natural numbers from 16 to 25. Their average is \(\frac{16+25}{2}=20.5\), so the sum is \(10\times20.5=205\). A value such as 195 can result from counting the number of terms or the average incorrectly. Exam tip: for consecutive terms, first count them using \((25-16+1)\).

Related tags

MathematicsSequences And ProgressionsNatural NumbersSum Of Consecutive IntegersArithmetic ProgressionSum Of First N Natural NumbersClass 9 Mcq

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