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Just Show me the formula:
In other words, how many different ways can you arrange the two letters like AB? Remember: order matters
Applied Example: A school bought a special kind of lock for all student lockers. Every student had to create his or her own pass code made up of 4 different numbers from 0-9.
This is an example of a common kind of problem involving ordering numbers. Notice how the order matters. If you made up a pass code of "3-5-9-0" but tried to use the same numbers in a different order like "5-3-9-0" you would not be able to get into your locker! Try the pass code generator below to see that no matter what numbers are used for the first, second, third and fourth digits, there are always the same number of available numbers for the following digit.
with repeated items