Răspuns:
A={4, 5, 6, 7}=B
C={0, 2, 4}
D={4, 5, 6, 7}
E={3, 4, 5, 6, 7, 8, 9}
Nici un copil nu are dreptate.
A=B=D
B#C
C#D
Mihai : A=B, B#C
Sonia : A=B=D, B#C, C#D
