Question 7
A combination lock can be opened only when its digit wheels are turned to the correct positions. Each wheel can be turned in either direction (upward or downward).
In the example, the lock currently reads 2719. Turning the rightmost wheel changes the units digit. Moving that wheel upward one position gives 0, while moving it downward one position gives 8.
What is the minimum number of one-position turns needed to open the lock, if the correct combination is 4383?
In the example, the lock currently reads 2719. Turning the rightmost wheel changes the units digit. Moving that wheel upward one position gives 0, while moving it downward one position gives 8.
What is the minimum number of one-position turns needed to open the lock, if the correct combination is 4383?