Mimi has two bags.
In the first bag there are 2 red balls and 8 green balls.
In the second bag there are 3 red balls and 7 green balls.
Mimi takes at random a ball from the first bag.
She then takes at random a ball from the second bag.
Work out the probability that Mimi takes two green balls.
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.