Hello, krzyrice!
Here are the first two . . . I'm working on the third one.
Let and be two events in a finite sample space.
True or false?
6. If , then and must be complementary. . True
We have: .
Hence: . . . . They are complementary.
This is a just rearrangement of the well-known formula:7. For all and . True
. . . .