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20% of the shoes in the factory are black. One shoe is chosen and replaced. A second shoe is chosen and replaced. Then a third shoe is chosen. What is the probility that none of the shoes are black?
The probability of not drawing a black shoe is 4/5. Since you replace the shoe each time, you multiply 4/5 by 4/5 by 4/5, which equals 64/125. The probability of not drawinga black shoe is 64/125.