In a study of the adequacy of fuel supplies, C stands for the event that a power plant will use coal, and E is the event that it will be able to provide enough electricity. State in words the probabilities expressed by:

1. P(C')
2. P(E')
3. P(C U E)
4. P(C n E)
5. P(C'n E )
6. P( C' n. E')