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A box contains a large number of washers; there are twice as many steel washers as brass ones. Four washers are selected at random from

A box contains a large number of washers; there are twice as many steel washers as brass ones. Four washers are selected at random from the box. What is the probability that:

a. There are 0 brass washers

b. There is 1 brass washer.

c. There are 2 brass washers.

d. There are 3 brass washers.

e. There are 4 brass washers.

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