MNM83
01.03.2021 •
Mathematics
A box contains 20 screws which are identical in size, but 12 of which are zinccoated and 8 of which are not. Two screws are selected at random, withoutreplacement.a. Find the probability that both are zinc coated.b. Find the probability that at least one is zinc coated.
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Ответ:
its the frist one (The ratio 9 to 12 is greater than 4 to 6.)
Step-by-step explanation: