P (an Ace AND a King) = 0 An Ace always has the word Ace on the card and a King always has the word King on the card. Regardless of their colors and whether they are hearts, diamonds, spades or clubs, an Ace and a King are always separate cards. No card has both the word Ace and King on it. So, one card cannot be both an Ace and King at the same time. If someone else has a more logical explanation, please share your understanding with the community.