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Please help! Thank you! An urn contains 20 white balls and 5 green balls. A sample of seven is selected at random. What is the probability that the

Please help! Thank you!

An urn contains 20 white balls and 5 green balls. A sample of seven is selected at random. What is the probability that the sample contains at least one green ball? 

a) 0.0000

b) 0.5968

c) 1.0000

d) 0.4032

e) 0.8387

f) None of the above.

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