The app provides an interactive platform for users to explore conditional probabilities using a probability tree. Using sliders the users can adjust probabilities of three events: $A, B,$ and $C$ that form a partition of the sample space. For another event $E$ the users can investigate the union, intersection, and conditional relationships with the events $A$, $B$ and $C$.
Drag the nodes or use the sliders to change the probabilities. Use the dropdown menus to set the probability to be calculated.