Răspuns :
a=b+2
ab=?
1. a=1
b=1+2;b=3
ab=13
2. a=2
b=2+2;b=4
ab=24
3. a=3
b=3+2;b=5
ab=35
4. a=4
b=4+2;b=6
ab=46
5. a=5
b=5+2;b=7
ab=57
6. a=6
b=6+2;b=8
ab=68
7. a=7
b=7+2;b=9
ab=79
Deci ab∈{13,24,35,46,57,68,79)
ab=?
1. a=1
b=1+2;b=3
ab=13
2. a=2
b=2+2;b=4
ab=24
3. a=3
b=3+2;b=5
ab=35
4. a=4
b=4+2;b=6
ab=46
5. a=5
b=5+2;b=7
ab=57
6. a=6
b=6+2;b=8
ab=68
7. a=7
b=7+2;b=9
ab=79
Deci ab∈{13,24,35,46,57,68,79)