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At a school exhibition, entry slips are numbered from 1 to 20. If the number of slips printed for each number equals that number, how many slips are printed in total?

Answer and explanation

Correct answer: 210

The total is the sum of numbers from 1 to 20. Using \(n(n+1)/2\), we get \(20\times21/2=210\). The value 200 comes from incorrectly taking \(20\times10\). Exam tip: identify \(n\) before applying the formula.

Related tags

Natural NumbersSum FormulaArithmetic ProgressionWord ProblemClass 9 MathematicsSum Of First N Natural NumbersSequences And ProgressionsMathematics

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