There are 9 chocolates in a box. 4 of the chocolates are milk chocolate. 5 of the chocolates are dark chocolate. Two chocolates are chosen at random from the box.
Work out the probability that one chocolate of each type is chosen.
You must show your working.
72 exam-style questions on OCR GCSE Maths Conditional Probability. Each one has a worked solution and a mark scheme showing where the marks go.