Campbell's theorem (probability)

Campbell's Theorem is a way to figure out the probability of something happening. It works by looking at how many ways an event can happen (for example, out of 4 possible choices, only 1 of them could be the correct answer) and figuring out what the chances are of one of those choices being correct. To figure out the probability, you divide the number of possible correct choices by the total number of possible choices. For example, if there are 4 possible choices and only 1 of them is right, the probability would be 1/4 or 25%. Campbell's Theorem makes it easier to figure out the probability of something happening, which is important in a lot of everyday activities.