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Rezolvați inecuatia:
(x-1)! <121


Răspuns :

(x-1)!<121
5!=1*2*3*4*5=120
(x-1)! -121<0 ⇒
x-1∈{0,1,2,3,4,5} ⇒
x∈{1, 2 , 3, 4, 5, 6}, adica  1≤x≤6, x∈N.