The symbol ∪ represents the union of events. the union of two events a and b results in an event that contains all the sample points of event a or event b or both events. therefore, a ∪ b is a new event that lists the sample points of event a or event b or both events. recall the set notation used for an event with k sample points. event = {sample point 1, sample point 2, , sample point k} event a is made up of the sample points e1, e4, and e6 and event b is made up of the sample points e2, e4, and e7. thus, the union of events a and b will have what sample points that are contained in either a or b?