There are 30 floppy disks in one box. 5 of them are defective. 4 random floppy...
Homework Answers
total 30 disks
5 are defective
hence 30-5 = 25 are intact
we select 4 disk
P(all are intact) = 25C4 / 30C4
= 25*24*23*22/(30*29*28*27)
= 0.46159
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