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PROBABILITY Probability of An Event: P(A) = The number of ways event (A) can occur The total number of possible outcomes Example: A single 6-sided die (1, 2, 3, 4, 5, 6) is rolled. What is the probability of each outcome? P(2 or 3) = number of ways to roll a 2 or 3 2 = total number of sides 6 P(even #) = number of ways to roll an even number = 3 6 total number of sides Independent Compound Events Two events, A & B, are independent if the fact that A occurs does not affect the probability of B occurring. To find the probability of two independent events that occur in sequence, find the probability of each event occurring separately, and then multiply the probabilities. P(A and B) = P(A) * P(B). Example: A coin is tossed and a single 6-sided die is rolled. Find the probability of landing on the head side of the coin and rolling a 3 on the die. P(Head) = and P(3) = =