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.

1. By Tomas Chlebecek

2. You select a card form a standard deck of 52 cards. Find the probability that the card is a 4 or an ace. If the card is a 4, it cannot be an ace. Use the Addition Rule to find the probability!

3. P(a or b) = P(a) + P (b) – P(a and b) If the events are mutually exclusive you may simplify the rule into…P(a or b) = P(a) + P(b) P(4 or Ace) = P(4) + P(Ace) = 4/52 + 4/52 = 8/52 = 2/13 = 0.154

4. As you can see…the Addition Rule helped me find the answer by adding the two Fractional Integers then simplifying the sum! The probability that the card drawn is either a 4 or an Ace is 0.154 !!! Or 15.4%