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12 supra 3x+1 sa fie nr natural

Răspuns :

3x+1 e {1; 2; 3; 4; 6; 12}
Daca 3x+1=1 --> x=0
Daca 3x+1=2 --> x=1/3=0,(3)
Daca 3x+1=3 --> x=2/3=0,(6)
Daca 3x+1=4 --> x=1
Daca 3x+1=6 --> x= 5/3=1,(6)
Daca 3x+1=12 --> x=11/3=3,(6)