There are 40 numbers on the dial, including the zero.Without knowing the combination numbers, what is the maximum number of trials required to open the safe (one trial equals one attempt to dial a full three-number combination)?There isn't a great deal of working out here you sort of get it or you don't. Beginning with the dial set at zero, the dial must be turned counter-clockwise to the first combination number, (then clockwise back to zero), and clockwise to the second combination number, (then counter-clockwise back to zero), and counter-clockwise again to the third and final number, where upon the door shall immediately spring open. ![]() ![]() You are to open a safe without knowing the combination.
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