10. Which one of the following statements is false? O2 AUB implies that if 2 E A, then 2 B {1, 2} CA implies that 1 E A and 2 A {2} C A B and {1} C B implies that {1, 2} C AUB {1, 2} CAN B implies that {1, 2} CA and {1, 2} CB