3) What is the probability of the event of randomly selecting a defective disk drive out of 50 available disc drives, of which 5 are defective? Also give the probability of the complementary event.
4) A computer operator must select 4 jobs from among 10 jobs waiting to be completed. How many different arrangements are possible?
5) A CRA auditor must audit 12 returns from a group of 22. How many different combinations are possible
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