A bag contains 6 red marbles, 9 white marbles, and 7 blue marbles. You draw 4 marbles out at random, without replacement. What is the probability that all the marbles are red? The probability that all the marbles are red is    . What is the probability that exactly two of the marbles are red? The probability that exactly two of the marbles are red is    . What is the probability that none of the marbles are red? The probability of picking no red marbles is    .

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