In a Set of 25 Aluminum Castings, Four Castings Are

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) 15,625

Correct Answer:

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