Sam has two bags.
In the first bag there are 4 blue buttons and 6 yellow buttons.
In the second bag there are 3 blue buttons and 5 yellow buttons.
Sam takes at random a button from the first bag.
He then takes at random a button from the second bag.
Work out the probability that Sam takes two yellow buttons.
54 exam-style questions on CCEA GCSE Maths Probability Trees. Each one has a worked solution and a mark scheme showing where the marks go.