There are 20 identical looking packets of white powder. 8 of them contain cocaine and 12 do not. Four of the packets are randomly selected. Let X equal the number of the selected packets which contain cocaine. a. How many possible ways are there to select the 4 out of 20 packets (order does not matter) without replacement? b. What is the probability that X = 0 c. What is the probability that X=4?

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