Also, the site provides some tests in the "Quiz Me" section to help users understand the definition of probability better. The addition rule is used to determine the probability of at least one of two ...

Experimental Probability: see "Empirical Probability." General Addition Rule: P(A or B) = P(A) + P(B) - P(A and B). General Multiplication Rule: P(A and B) = P(A|B)P(B). Impossible Event: event that ...

To calculate the probability of an event ... space diagram is enough but in more complex situations the product rule for counting is needed. The rule is: To find the total number of outcomes ...