Each of four friends orders a sweatshirt from a catalog. There are 18 colors of

Mathematics
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Each of four friends orders a sweatshirt from a catalog. There are 18 colors of sweatshirts, 6 of which are all cotton and 12 of which are a blend. Each one orders a different color (no repeats) at random. What is the probability that the friends order only cotton sweatshirts?

a.77/255

b.1/15

c.1/204

d.91/15

Apr 27th, 2015

First person has a 6/18 chance of getting a cotton sweatshirt

Second person has a 5/17 chance

Third person has a 4/16

Fourth person 3/15

Multiply all of these and we get 360/73440 = 1/204 (choice C)

Apr 27th, 2015

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