There are 210 4 digit combinations and 5040 different 4 digit codes.
7 bits can make 128 distinct codes.
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.
Assuming you mean the 13 digit bar code and by "combinations" the mathematical permutations, then there are 1012 different bar codes - the 13th digit is a check digit based on the other 12. On the 8 digit bar code there are 107 different bar codes - the 8th digit is a check digit based on the other 7. "Combination" has a specific meaning in maths: Permutations are sets arranged in order whereas Combinations are sets where order does not matter. So for the six sets: {1, 2, 3}, {2, 3, 1}, {3, 1, 2}, {1, 3, 2}, {2, 1, 3}, {3, 2 1} they are different permutations of the digits 1, 2 & 3 (as the order changes each time) but the same combination (as each set contains one 1, one 2 and one 3 in some order). The same is true of the six numbers: 123, 231, 312, 132, 213, 321 They are different permutations of the three digits 1, 2 & 3 but the same combination of them - each number contains one 1, one 2 and one 3.
Combination codes are actually permutations and notcombinations. The number of codes depends on how long (how many digits) the code is and that is not specified in the question. Also, the number of codes depends on whether or not the digits may be repeated - again, not specified in the question.There are 24 permutations that use each of the numbers once in a 4-digit code.There are infinitely many codes in which the numbers can be used repeatedly, each an infinite number of times!
2
6,720 combinations.
I would have to say 10,000 possible combinations. (0000, 0001, 0002 through 9998, 9999)
One bar code can have anywhere from 30 to 70 different combinations within itself. How many combinations are in the world is not known.
In texting there are many different codes and meaning for letter and symbol combinations. The .V combination is a way of making the letter and dot look like Pac-Man.
There can be 103 = 1000 codes.
If you include 0000, ten thousand unique four digit codes are possible.
because that way they can make more codes the more combinations the more codes
The ALT codes for symbols can be created using various key combinations. Specific key combinations can be found by viewing symbol settings.
Binary is easier for the computer to understand. It is also easier to handle and is not costly.
With no other constraints, 26 x 26 x 26 = 17,576 possible three-letter codes.
7 bits can make 128 distinct codes.
Counting from 000 to 999 would give a possible 1000 combinations.