Probability Tree Diagrams: Visually map out all possible outcomes and probabilities in a sequential random experiment, like drawing balls from a bag without replacement.

Probability Calculation: For each draw, adjust the probabilities based on prior outcomes.

Calculating Compound Probabilities: Multiply probabilities along each branch to find the likelihood of specific outcomes.

Verifying Total Probability: The sum of probabilities for all possible outcomes should equal 1, ensuring no outcomes are missed.

Probability of Specific Events: To find probabilities for specific events, like drawing at least one blue ball, add up relevant outcomes or use complementary probability.