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Question

In a set of 25 aluminum castings, four castings are defective (D), and the remaining twenty-one are good (G). A quality control inspector randomly selects three of the twenty-five castings without replacement, and classifies each as defective (D) or good (G). The sample space for this experiment contains ____________ elementary events.
a) 12,650
b) 2,300
c) 455
d) 16
e) 15,6255

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