A jar contains 20 red marbles, of which 10 are large and 10 are small, and 30 blue marbles, of which 10 are large and 20 are small. If 1 marble is randomly selected from the jar,               a. What is the probability of obtaining a blue marble?               b. What is the probability of obtaining a large marble?               c. What is the probability of obtaining a large blue marble?

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