This lesson will explain the general addition rule for probability. It is 3 of 4 in the series titled "Either/Or Probability for Overlapping Events." [5:08]

This lesson will explain the rule for finding the probability of at least one of two or more non-overlapping events happening. It is 4 of 4 in the series titled "Either/Or Probability for Non-Overlapping Events." [4:33]