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Sagot :

bonjour

( n + 1 ) ( n + 2 )

= n ² + n + 2 n + 2

= n ² + 3n + 2

( n ² + 3n + 2 ) / ( n + 1 )

= ( n + 1 ) ( n + 2 ) / ( n + 1 )

= ( n + 2 )

bonne journée

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