bonjour
1 / ( n + 1) - 1 / n = - 1 / n ( n + 1 )
1 (n) / n ( n + 1 ) - 1 ( n + 1 ) / n ( n + 1 )
= n - n - 1 / n ( n + 1 )
= - 1 / n ( n + 1 )
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bonjour
1 / ( n + 1) - 1 / n = - 1 / n ( n + 1 )
1 (n) / n ( n + 1 ) - 1 ( n + 1 ) / n ( n + 1 )
= n - n - 1 / n ( n + 1 )
= - 1 / n ( n + 1 )