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An appliance repairman services a fixed number of drying machines on site each day of which 15% requires installation of a particular part. Assume that

An appliance repairman services a fixed number of drying machines on site each day of which 15% requires installation of a particular part. Assume that the repairman starts the day with 5 parts. What is the probability that he will use all the 5 parts after 20 customer visits?

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