Second chance! Review your workings and see if you can correct your mistake.
A building contains 24 rooms in total.
9 of the rooms are on the top floor.
7 of the rooms have red walls.
2 of the rooms that are on the top floor also have red walls.
Work out the probability that a room picked at random is
neither on the top floor nor has red walls.
Give your answer as a fraction in its simplest form.
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