Question

Determinați cifrele x si y:
9xy divizibil cu 6

Answer 1

y∈{0,2,4,6,8}
daca y=0 ⇒x∈{0,3,6,9} ⇒nr 900,930,960,990
 daca  y=2 ⇒x∈{1,4,7} ⇒nr 912,942,972
daca y=4 ⇒x∈{2,5,8}⇒ nr. 924,954,984
dacay=6 ⇒x∈{0,3,6,9}⇒nr. 906.036,966,996
daca y=8⇒x∈{1,4,7} ⇒nr=918,948,978