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A bag contains 7 blue marbles, 5 green marbles, and 13 white marbles

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A bag contains 7 blue marbles, 5 green marbles, and 13 white marbles.Erik reaches into the bag and randomly pulls out three marbles.
a. How many different sets of three marbles can Erik pull out of the bag?
b. What is the probability that all three marbles are different colors?
c. What is the probability the marbles are all the same color?