There are 12 pens in a box.
4 pens are red. 5 pens are blue. 3 pens are green.
One pen is selected at random from the box.
Write down the probability that pen is green.
Write down the probability that pen is black.
236 exam-style questions on AQA GCSE Maths Probability. Each one has a worked solution and a mark scheme showing where the marks go.