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30-seconds-of-code/snippets/sumN.md
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sumN math,beginner 2020-10-08T16:52:55+03:00 2020-10-22T20:24:30+03:00

Sums all the numbers between 1 and n.

  • Use the formula (n * (n + 1)) / 2 to get the sum of all the numbers between 1 and n.
const sumN = n => (n * (n + 1)) / 2;

sumN(100); // 5050