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Calculați (n+1)! + (n+2)!



Răspuns :

   
(n+1)! + (n+2)! = (n+1)! + (n+1)! × (n+2) = (n+1)! (1 +(n+2)) = (n+3)(n+1)!



= (n+1)! (1+n+2) = (n+1)! (n+3)
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