Răspuns :
a,b∈N
a+b=42
a,b∈(15,25)|a,b|6
⇒a,b=6,12,18,24,30.36..........
15<a,b<25⇔a=18 atunci b=42-18=24
a=24 atunci b=18
a+b=42
a,b∈(15,25)|a,b|6
⇒a,b=6,12,18,24,30.36..........
15<a,b<25⇔a=18 atunci b=42-18=24
a=24 atunci b=18