Work out tree diagram probability instantly with clear inputs, formula shown and shareable results.
In a probability tree the chance of a particular path is the product of the branch probabilities along it. Summing over paths gives compound event probabilities, and the branch probabilities at each node must total 1.
Path probability
multiply the branch probabilities along the path
Expected successes
E = Σpᵏ across independent stages
The full success path has probability 0.168, and at least one success occurs with probability 0.928.
Each step is conditional on reaching that node, and the multiplication rule chains those conditionals together.