(n+1)²-(n-1)² = (n²+2n+1)-(n²-2n+1) = n²+2n+1-n²+2n-1 = 4n
Donc Antoine a raison.
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(n+1)²-(n-1)² = (n²+2n+1)-(n²-2n+1) = n²+2n+1-n²+2n-1 = 4n
Donc Antoine a raison.