F∩G = observe a 4 and a number greater than 4

= {4} ∩ {5,6}

= ∅ (the “empty set”)

Definition: Two events A and B are said to be disjoint if A∩B=∅.

F and G are disjoint events.

Venn Diagram:

Note: Two events are disjoint when they cannot happen at the same time.

A

B