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.