Sometimes in life we want to know the probability of many things happening, not just one. Sarah has a bag containing 4 red balls and 5 green balls (9 balls in total). If she were to select a ball at ...

Adam Hayes, Ph.D., CFA, is a financial writer with 15+ years Wall Street experience as a derivatives trader. Besides his extensive derivative trading expertise, Adam is an expert in economics and ...

Sometimes we want to know the probability of getting one result or another. The OR rule can help us here if the two results are mutually exclusive. Mutually exclusive means that the two outcomes of ...