6.8.39 Set Theory

Condition: let the universal set \ (U- \) many employees of a certain company. A - many employees of this organization over 35 years old; B - many employees who have been working for more than 10 years; C - many managers of the company. What is the substantial meaning (characteristic property) of the following set: 1 \ () a \ cup (b \ cap \ bar {c}) \); 2) \ (A \ CAP B \ CAP C \); 3) \ (B \ BACKSLASH C \).