Any 3 from 10 in any order = 10 x 9 x 8 = 720
It depends on what other restrictions you place on the numbers. For example, in North America (country code +1 = USA, Canada, etc.), area codes cannot have 0 or 1 as the first digit, and cannot have 9 as the second digit.
The answer is 720 different area codes. This is how you calculate it. There are 10 different numbers for the first category, then 9 for the second and 8 for the third, then you multiply those numbers in this order: 10 x 9=90, then 90 x 8=720.
If you include 0000, ten thousand unique four digit codes are possible.
10*9*8*7*6=30,240
As far as I can tell, all 5 digit numbers are potential zip codes, so there are 99999 + 1 potential zip codes, or 100,000. Many of these are not actually is use.
The number of 4 digit codes, using different digits, is 10*9*8*7 = 5040. However, computer passwords can, usually, have repeated digits and, if that is allowed, you can have 104 = 10000 codes.
Any 4 from 10 in any order = 10 x 9 x 8 x 7 = 5040
The answer is 720 different area codes. This is how you calculate it. There are 10 different numbers for the first category, then 9 for the second and 8 for the third, then you multiply those numbers in this order: 10 x 9=90, then 90 x 8=720.
If you include 0000, ten thousand unique four digit codes are possible.
10*9*8*7*6=30,240
there are 37 different codes this was wrote in 2012 so they might have created new codes in the future .
the repeated digits can lie in any of 3 positions:XXYZ,YXXZ, or YZXXTherefore, the number of different possible repeated digit combinations is 10×3=30 (there are 10 different possible digits).There are then 9 values left that Y could be, after the X's have their values, and 8 values left that Z could be, to ensure no unintended repeated numbers.This gives (10×3)×9×8=2160. There are therefore 2160 possible codes.
As far as I can tell, all 5 digit numbers are potential zip codes, so there are 99999 + 1 potential zip codes, or 100,000. Many of these are not actually is use.
The Codes was created in 1966.
The number of 4 digit codes, using different digits, is 10*9*8*7 = 5040. However, computer passwords can, usually, have repeated digits and, if that is allowed, you can have 104 = 10000 codes.
Clash of the Codes was created in 1994.
Codes in the Clouds was created in 2007.
104 = 10000 if digits can be repeated, 5040 if not. The above answers assume a code can start with a 0. If not, 9000 if digits can be repeated and 4536 if not.