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What is the difference between the sum of the first (26) natural numbers and (26)?

Answer and explanation

Correct answer: 325

The sum of the first 26 natural numbers is
\(S_{26}=\frac{26\times27}{2}=351\). Therefore, subtracting 26 gives
\(351-26=325\). This is also the sum of the first 25 natural numbers. For example, 315 is not the correct sum of the first 25 natural numbers. Exam tip: remember that the sum of the first \(n\) natural numbers is \(\frac{n(n+1)}{2}\).

Related tags

MathematicsSequences And ProgressionsNatural NumbersSum Of N Natural NumbersArithmetic CalculationSum Of First N Natural NumbersClass 9 Mcq

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