Que vaut la somme des 2020 premiers entiers naturels ?.... Pergunta de ideia demarguerite17

marguerite17 @marguerite17

December 2020 1 106 Report

Que vaut la somme des 2020 premiers entiers naturels ?

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Réponse :

On a $1+ 2+ 3 + ... +n = \frac{n(n+1)}{2}$

Ici n = 2020

donc

$1+ 2+ 3 + ... + 2020 = \frac{2020\times 2021}{2} =2 041 210$

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