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What is the value of (1+2+3+\cdots+27)?

Answer and explanation

Correct answer: 378

The sum of the first 27 natural numbers is found using \(S_n=\frac{n(n+1)}{2}\). Thus, \(S_{27}=\frac{27\times28}{2}=27\times14=378\). Therefore, 378 is correct. A value such as 364 can result from an arithmetic error while multiplying or dividing. Exam tip: Cancel the even factor with 2 before multiplying.

Related tags

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

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