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1. A box contains 4 bad and 6 good tubes. Two are drawn out. (a)The first one is tested and found to be good. Whats

1. A box contains 4 bad and 6 good tubes. Two are drawn out. (a)The first one is tested and found to be good. What’s theprobability that the second one is good? (b) One out of two chosentubes is tested and found to be good. What’s the proba- bility thatthe other is good?

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