# math

posted by
**Sara!** on
.

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