In a shipment of 8 refrigerators there are two that are defective A trader is interested in acquiring four of these and tests them before to buy them to 

a What is the probability that he finds the two defectives in the third test 

b What is the probability of finding the two defective at or before the fourth test 

c What is the probability of finding the second faulty refrigerator In the third or fourth test, if you found the first defective in the first or second test

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refa gerators 2 de fective 28 Poobabi iy of dofective ... View the full answer