A box contains 7 fiction books, 5 non-fiction books, and 3 biographies. Two books are selected from the box at random without replacement.
Draw a tree diagram to represent this information.
Find the probability that the two books selected are both biographies.
Given that at least one of the books selected is non-fiction, find the probability that both books are non-fiction.
164 exam-style questions on WJEC A Level Maths 4.1 Probability (A-level only), covering 4.1.1 Probability (A-level only), 4.1.2 Probability (A-level only), and 4.1.3 Probability (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.