SOLUTION: 3 folders are picked from a lot of 100 folders in which 10 folders are defective. what is the probability of the event that all 3 folders are non-defective?

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Question 339006: 3 folders are picked from a lot of 100 folders in which 10 folders are defective. what is the probability of the event that all 3 folders are non-defective?
Answer by edjones(8007) About Me  (Show Source):
You can put this solution on YOUR website!
nCr=Combination of n things taken r at a time.
P=90C3/100C3
=117,480/161,700
=.7265...
.
Ed