Table of Contents
How many different codes of 4 digits are possible if the first digit?
10,000 possible combinations
There are 10,000 possible combinations that the digits 0-9 can be arranged into to form a four-digit code.
How many variables are in a 4-digit code?
There are 10,000 possible combinations that the digits 0-9 can be arranged to form a 4-digit pin code.
How many possible security codes are available if the digits can be repeated?
5040 different codes
Roy Ø. You have 10 different digits for the first place (that is, if 0 is allowed), when that is chosen, you have 9 left and so on, i.e. 10⋅9⋅8⋅7=5040 different codes.
How many ways can a code be formed from the digit 0 to 9 if a combination lock must contain 5 different digits?
The trick is to realize that a number can not start with a zero! Now, there are 105 ways in which the digits 0-9 can be chosen for the five places of a five digit number.
How many numbers are there in a code?
Codes are five digits in length. Short codes will start with either a “3” or “4”. For example, 34001 or 42001.
How many license plates can be made consisting of three letters followed by two digits?
As L can be anything from A to Z , there are 26 combinations for that and as repetition is allowed, for second and third letters, we again have 26 combinations available and thus 26×26×26=17576 combinations for letters. But digits are from 0 to 9 i.e. 10 combinations for each place and tolal 10×10=100 combinations.
How many security codes are there?
There are 10,000 possible security alarm code combinations (using the numbers 9-0). So, theoretically, if a thief wanted to try to guess your 4-digit code they’d have a 1 in 10,000 chance of getting it right. Those are pretty good odds for you—and terrible for thieves.
How many combinations are for a lock with three numbers that range from 0 to 9?
If order mattered, we would say select the first number (10 choices), then the second (9 choices) then the third (8 choices). So there would be 10 x 9 x 8 = 720 possible choices.
How long is the code on a bike lock?
There are usually 3, 4 or 5 rings so the code is 3, 4 or 5 numbers long. These locks are popular because you don’t need a key: as long as you can remember the code you can always unlock your bike. And you can also give the code to family or friends so they can share the use of the lock and therefore your bike too! Just try every combination!
What is a combination bike lock?
So, just to be clear: combination bike locks are the ones with a several dials of numbers that you turn around to make a combined code that opens the mechanism. There are usually 3, 4 or 5 rings so the code is 3, 4 or 5 numbers long.
Do I need a key to unlock my bike?
These locks are popular because you don’t need a key: as long as you can remember the code you can always unlock your bike. And you can also give the code to family or friends so they can share the use of the lock and therefore your bike too! Just try every combination!
Are combination locks less secure than keyed locks?
So this idea that all combination locks are crappy is reinforced because they’re used on genuinely crappy cable locks. However, it doesn’t mean that all combination locks are crappy! So, yes it’s true: combination locks are less secure than keyed locks.