A safe has a 4-digit lock code that does not include zero as a digit and no digit is repeated. What is the probability of a lock without all even digits? There to get a lock code with all even digits. There are 3,024 different 4-digit lock codes. There are to get a lock code without all even digits. The probability of a 4-digit lock code without all even digits is

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28 June, 18:33

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Raphael · Answer 1

Probability of lock code with all even digits = (4/9) ^ 4 = 256/6561 = 0.039

So probabiilty of lock without all even digits = 1 - 0.039 = 0 ... 961.