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A hospital obtains 40% of its flu vaccine from company A, 50% from company B and 10% from company C. From past experience its known that 2% of the vials from A are ineffective, 1% from B are ineffective and 4 % from C are ineffective. The hospital tests five vials from each shipment. If at least one of the five is ineffective, find the conditional probability pf that shipment's having come from C.

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