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Mathematics 17 Online
OpenStudy (anonymous):

Bag contains 9 blue balls, 3 red balls. A ball is selected at random, colour recorded and NOT replaced. A second ball is selected at random, colour recorded. a) Draw tree diagram (no problem). Part 2 a) Find probability second ball is red (no problem, 0.25) b) Find probability both balls selected are red, given that the second ball is red. I'm having a problem understanding where my logic is wrong.

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