It is often important and necessary to provide a mathematical description or model for randomness. This section provides insights into how this can be done. The following table displays the sums that can be obtained from this event.
Some sources use the phrase mutually exclusive to describe events that are disjoint.
Two events are independent if knowing that one occurs does not change the probability of the other. If the first card was replaced in the deck, and the deck reshuffled before event D, then C and D would be independent.