Question 1171068
probability is 7/12*(6/11)=7/22
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probability none of the three is good is (5/12)(4/11)(3/10)=60/1320=1/22. So at least 1 is good is 21/22. 
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(7/12)(6/11)(5/10)(4/9)=42/132* 2/9=7/99=0.0707
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(5/12)(4/11)(3/10)(2/9)(7/8)=7/792=0.0088