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Three tubes are chosen successively and at random each time

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Reference no: EM13580453

A shipment of 20 TV tubes contains 16 good tubes and 4 defective tubes. Three tubes are chosen successively and at random each time and are also tested successively. What is the probability that:

(i) The third tube is good if the first two were found to be good?

Reference no: EM13580453

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