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A briefcase has a three-digit lock code that does not include zero as a digit. What is the probability that the lock code consists of all even digits if the same digit is not used more than once in the lock code?

 Apr 5, 2020
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total codes possible with no zero    9 x 8 x 7    =   504

    4 out of 9  numbers are even      4 x 3 x 2    =   24        all even

 

24/504      or    1/21   

 Apr 5, 2020

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