Bonjour prouvez vous m aider : Exercice
soient n et a deux entiers naturel. non nuls
on pose s= (a +1) + ( a + 2) + ( a + 3) + .......+(a+n)
1) montrer que 1 + 2+ 3+ ... + n = n(n+1) ÷ 2

merci d avance ​
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