A three-digit code for certain locks uses the digits 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 according to the following constraints. The first digit cannot be 0 or 1, the second digit must be 0 or 1, and the second and third digits cannot both be 0 in the same code.
By comparison, this 3-dial lock (three wheels, each with digits 0-9) has 10 × 10 × 10 = 1, 000 possible combinations.
The CVV is a 3 digit code embossed or imprinted on the reverse side of Visa, MasterCard and Discover cards. Visa, MasterCard and Discover have been using the CVV since the late 1990's.
A three digit lock can have its key value between range "000" - "999". So basically 1000 combinations have to be tried to open the lock.
The first problem with these locks is the limited number of combinations. With 3 dials there are just 720 unique codes. So with averagely nimble fingers, which could test one number per second, that's a maximum of just 12 minutes to test every combination.
They start from 100 and go on till 999. For example, 673, 104, 985 are 3-digit numbers. It is to be noted that the first digit of a three-digit number cannot be zero because in that case, it becomes a 2-digit number. For example, 045 becomes 45.
So there are 120 ways to chose a three digit number from 10 digits. If you are meaning simply a 3 digit number using digits 0–9 then the answer is 10•10•10 = 1,000 with repetition. 10•9•8 = 720 without repetitions.
Debit Card CVV Code
A CVV code is a three- or four-digit code (depending on your credit card company) and is also known as the security code. On Visa, Mastercard, and Discover cards, you can find the three-digit number on the back of your card.
Answer: The highest three-digit number in the decimal is 999. Explanation: If you add 1 to this number it becomes 1000 which is a four digit number. So 999 is the highest three digit number in the number system.
To unlock a button-type privacy lock, take your tool (small screwdriver, paperclip, or other thin objects) and insert it into the hold as far as you can. Next, apply force by pushing the tool further into the keyway. With enough force, you should feel the locking mechanism click. That's it.
Group 2 combination locks are the most common type found on home safes today. They provide one-, two-, or three-number combinations. Group 1 locks provide a greater degree of protection as they can offer combinations of up to six numbers. These locks are also sturdier, and have more wheels in the lock mechanism.
If you have a code safe, the electronic lock may have stopped working due to a number of problems. The battery may be dead or the connections to the electronic lock may be damaged. It is also possible that the control panel is damaged or that the electronic locking system is defective.
The factory-set combination is 0-0-0-0. Turn the shackle 90° counterclockwise. Press the shackle down while turning the shackle another 90° counterclockwise. Set the dials to your new combination.