The probability that the lock code will begin with the number 5 is; 1/9 while the probability that the code will not contain the number 0 is; (8/9)³.
It follows from the task content that the probability of different scenarios of the lock code.
The probability that the lock code will begin with the number 5 is; 1/9 following from the definition of probability as the ratio of the number of required outcome to the number of possible outcomes.
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