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What is the probability that the first DVD taken from Roger's pack is defective? Unfortunately for Roger, the first DVD he chooses is defective! What

What is the probability that the first DVD taken from Roger's pack is defective?

Unfortunately for Roger, the first DVD he chooses is defective! What is the probability that the DVD came from the bankrupt supplier?

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Roger bought a pack of cheap DVDS. Afterwards he learnt that 20% of the packs in the store came from a bankrupt supplier, with an appalling record of 15% defective DVDs. The remaining packs of DVDs came from a reputable supplier, with a defective rate of 1%

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