There are 5 orange marbles, 7 yellow marbles, and 4 red marbles in a bag. It is equally possible that any marble will be drawn from the bag.

What is the probability of drawing a blue marble?

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If 2 marbles are drawn from the bag, without replacement, what is the probability of drawing all yellow marbles?

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If 3 marbles are drawn from the bag, with replacement, what is the probability of not drawing 3 red marbles?

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