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A jar contains 7 red marbles, numbered 1 to 7, and 11 blue marbles numbered 1 to 11. a) A marble is chosen at random.

A jar contains 7 red marbles, numbered 1 to 7, and 11 blue marbles numbered 1 to 11.

a) A marble is chosen at random. If you're told the marble is blue, what is the probability that it has the number 3 on it?

b) The first marble is replaced, and another marble is chosen at random. If you're told the marble has the number 1 on it, what is the probability the marble is blue?

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