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Quality Control: Copykwik has 4 copiers A,B,C, and D. The probability that a given machine will break down on a particular day is A=1/50, B=1/60, C=1/75, D=1/40.

Question: What is the probability on a particular day that all 4 machines will break down?

Question: What is the probability that none of them will brakdown?

 

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