If the probability of one event happening affects the probability of other events happening, then the two events are not independent. A sock drawer contains 5 white socks and 4 black socks.

If the probability of one event happening affects the probability of other events happening, then the two events are not independent. A sock drawer contains 5 white socks and 4 black socks.

Five people have been shot at an adult education centre in Sweden, police have said, with four in the hospital. Authorities ...