The document discusses using the Addition Rule to calculate the probability of drawing either a 4 or an ace from a standard 52-card deck. It states that the probability of drawing a 4 plus the probability of drawing an ace is equal to the total probability, since a card cannot be both a 4 and an ace. It then shows the calculation of 4/52 + 4/52 = 8/52 = 2/13 = 0.154, which is the 15.4% probability of drawing either a 4 or an ace.