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calculati:

1/(n+1)! - 1/(n+2)!


Răspuns :

1/(n+1)!- 1/(n+2)!= 1/(n+1)!- 1/(n+1)!(n+2)=  n+2-1/ (n+1)! (n+2)= n+1/ n!(n+1)(n+2)= 1/n!(n+2).