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The safe lock consists of three disks: the first one marked [#permalink]
19 Dec 2003, 01:24
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The safe lock consists of three disks: the first one marked from 0 to 9, the second marked with even digits, and the third marked with 1 and 0. A certain guy has a one attempt to open the safe by rotating disks randomly. Assuming that there is the only correct combination to open the safe, what is the probability that the guy will not open the safe?