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afla numerele naturale de forma x21y

Răspuns :

x= 1,2,3,4,5,6,7,8,9.
y= 0,1,2,3,4,5,6,7,8,9.
x21y 
x∈{1,2,3,4,5,6,7,8,9} 
y∈(0,1,2,3,4,5,6,7,8,9} 
 de aici scoti toate numerele, avand in vedere toate aceste variante