A box contains 20 screws which are identical in size, but 12 of which are zinc coated and 8 of which are not. Two screws are selected at random, without replacement. a. Find the probability that both are zinc coated. b. Find the probability that at least one is zinc coated.

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
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Chapter0: Preparing For Algebra
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A box contains 20 screws which are identical in size, but 12 of which are zinc
coated and 8 of which are not. Two screws are selected at random, without
replacement.
a. Find the probability that both are zinc coated.
b. Find the probability that at least one is zinc coated.

 

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