A museum archive contains 13 ancient scrolls that require restoration: 6 from the Dynasty era, 4 from the Classical era and 3 from the Hellenistic era.
The curator selects two scrolls at random, one after the other, without replacement.
In this question you must show detailed reasoning.
Draw a tree diagram to show the possible outcomes and their probabilities.
Find the exact probability that the curator selects one Classical era scroll and one Hellenistic era scroll.
200 exam-style questions on OCR A Level Maths 2.3 Probability, covering 2.3.1 Mutually exclusive and independent events, 2.3.2 Diagrams to assist probability calculations, 2.3.3 Conditional probability (A-level only), 2.3.4 Conditional probability from first principles (A-level only), and 2.3.5 Modelling with probability. Each one has a worked solution and a mark scheme showing where the marks go.