may be they are dependent in the last mutually exclusive case because if one increases then other one have to decrease as there is condition of no intersection.
this is such an important point.... I was not taught how to access conditional probabilities and its such a basic thing! Understanding conditional probabilities is a prerequisite to understanding Baysian statistics, or at least the Bayes Theorem!
Please keep uploading more and more videos justin, i have never enjoyed statistics and probability as much as i enjoy them through your videos, love from India♥️