Venn diagrams can be useful for organising information about frequencies and probabilities, which can then be used to solve conditional probability problems.

Probabilities can be written as fractions, decimals or percentages on a scale from 0 to 1. Knowing basic facts about equally likely outcomes can help to solve more complicated problems.

Yánez, G.C. (2002) Some Challenges for the Use of Computer Simulations for Solving Conditional Probability Problems. The 6th International Conference on Teaching Statistics, Cape Town.