Mimi has two bags.
In the first bag there are 4 red balls and 6 green balls.
In the second bag there are 5 red balls and 4 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 OCR GCSE Maths Probability Trees. Each one has a worked solution and a mark scheme showing where the marks go.