Wednesday
November 26, 2014

Homework Help: math

Posted by Sara! on Monday, May 17, 2010 at 8:49pm.

in a shipment of 20 computers, 3 are defective

three computers are randomly selected and tested. what is the probability that all 3 are defective if the first and second ones are not replaced after being tested.

a. 1/760
b.1/1140
c.27/8000
d.3/5000

i chose D, is this correct

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