Fast unlocking of three-digit cipher box

How to unlock the three-digit password box quickly

1. permutation and combination method: according to the multiplication principle of permutation and combination, it can be concluded that 3 digits * * in the password box can form1001(1000+1) passwords.

2. Observe the groove of the wheel: aim the wheel of the cipher box at the place with strong light, look in from the gap of each wheel, and slowly turn the wheel, and you can see that there are two depressions on the wheel. The big depression plus 5 is the password of this wheel.

3. Use known passwords: If you know some passwords, you can use this to unlock them step by step.