P(path) = product of conditional branch probabilities

1. گام 1Check branches from each node sum to one.
2. گام 2Multiply along each path.
3. گام 3Add relevant terminal paths for the target event.

Reversing a tree changes the conditional probabilities needed.

Run and edit the code, inspect intermediate output, and use the movable R Code Guide while practising.

Name the event, denominator, probability interpretation, and one operational limitation.

Use a hint before submitting if needed. Full calculations and interpretations appear after submission.