This is a whole lesson on tree diagrams, but there is probably (pun intended) enough material for two lessons (with and without replacement)... the lesson comes with a starter, learning objectives, keywords, excellent examples of replacement and non-replacement and one example of conditional probability, questions with answers and plenary.
Even though this lesson is aimed at higher tier pupils at GCSE, there is a couple of A-Level questions included with answers, so that I can use the same material for my A-Level S1 Statistics classes. If you are interested in the A-level resources then I do recommend buying this and also buying my series on sets, which also crosses over with this lesson on the probability content. 19 slides + resources.
NOTE: Feel free to browse my shop for more excellent free and premium resources, and as always please rate and feedback, thank you.