Section 4.1: Basic Concepts of Probability 1: Definitions and Important Facts: . Event: . Simple Event: . Sample Space: . Complement: . For any event A, the probability of A, denoted as P(A), is always between and . The probability of an impossible event is . The probability of an event that is certain to occur is . If necessary, round your answer of probabilities to significant digits/decimal places. . If we denote A as the complement of an event A, then we have the formula: P(A) = 1 - . The general formula to calculate the probability of event A is P(A) =