15. In the "secret" lock on the common axis are four disks, each of which is divided into five sectors, on which the numbers are written. The lock opens only if the disks are mounted so that the numbers on them make up a certain four-digit number. Find the likelihood that when installing disks randomly, the lock will open.

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Chapter9: Counting And Probability
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15. In the "secret" lock on the common axis are four disks, each of which is divided into five
sectors, on which the numbers are written. The lock opens only if the disks are mounted so
that the numbers on them make up a certain four-digit number. Find the likelihood that
when installing disks randomly, the lock will open.
Transcribed Image Text:15. In the "secret" lock on the common axis are four disks, each of which is divided into five sectors, on which the numbers are written. The lock opens only if the disks are mounted so that the numbers on them make up a certain four-digit number. Find the likelihood that when installing disks randomly, the lock will open.
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