In Box A, there are 5 white marbles and 3 black marbles.
In Box B, there are 4 white marbles and 7 black marbles.
Tom chooses one marble at random from Box A and then chooses one marble at random from Box B.
Work out the probability that Tom chooses two white marbles.
54 exam-style questions on WJEC GCSE Maths Probability Trees. Each one has a worked solution and a mark scheme showing where the marks go.