Security

The safe's security code is set with three dials. The first dial has five different letters, the second dial has the digits 0 to 4, and the third dial has the digits 5 to 9. One code can be set in approximately 1 second. How should the alarm be timed so that it sounds after one-fifth of the time it would take to try all possible codes?

Final Answer:

t =  42 s

Step-by-step explanation:

n=5 5 5=125 t=n/1/3=125/1/3=42 s



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