A={x∈N l x:6. x<50}
x= 48; 48:6=8 (48 e divizibil cu 6)
x=42; 42:6=7
x=36, 30, 24, 18. 12, 6
asadar A={6,12,18,24, 30,36,42,48}
B={3,6,9,12,15, 18,21,24,27,30,33,36,39,42,45,48}
C={2,4,6,8,10,12,14,16,18,20,22,24,26,28,30,32,34,36,38,40,42,44,46,48}
a) B⊂C (fals)
b) A⊂C (adevarat)
c) B∪C=A (fals)
d) B∩C=A (adevarat)
e) {2,3,6}⊂B∪C adevarat
f)
