Question

Fie A={x | x ∈ N*, x < 9}, B={x | ∈ N,x -numar natural de o cifra } , C= {x | x ∈ N, 1 < x < 4 }. aflati
a) A ∪ B c) A ∪ C e)B∪C g)A∩B
b)A ∩ C d) B ∩ C f)A∩B∩C h)CU(A∪B).
dau coroana si 40 puncte!!!

Answer 1

A={1,2,3,4,5,6,7,8}
B={0,1,2,3,4,5,6,7,8,9}
C={2,3}
a)A U B={0,1,2,3,4,5,6,7,8,9,}
c)A U C={1,2,3,4,5,6,7,8}
b)A ∩ C={2,3}
d)B ∩ C={2,3}
e)B U C={1,2,3,4,5,6,7,8,9}
f)A ∩ B ∩ C={2,3}
g)A ∩ B={1,2.3,4,5,6,7,8}
h)C U(A U B)={0,1,2,3,4,5,6,7,8,9,}

Answer 2

A={x | x ∈ N*, x < 9}   adica A ={1,2.3,4.5,6,7,8}.
B={x | ∈ N,x -numar natural de o cifra }   B ={0,1,2,3,4,5,6,7,8,9}
C= {x | x ∈ N, 1 < x < 4 }   C={2,3}

a) AUB ={0,1,2,3,4,5,6,7,8,9,}
b) A inters C ={2,3,}
c) AUC ={!,2,3,4,5,6,7,8,}
d) B inters C ={2,3}
e) BUC ={0,1,2,3,4,5,6,7,8,9,}
f) A inters B inters C={2,3}
g) A inters B ={1,2,3,4,5,6,7,8)
h) CU(AUB) = {0,1,2,3,4,5,6,7,8,9}