2
12 numbers
If you want 4-digit numbers, there are 24 of them.
3 x 4 x 4 x 4 = 192 of them
Assuming that the first digit of the 4 digit number cannot be 0, then there are 9 possible digits for the first of the four. Also assuming that each digit does not need to be unique, then the next three digits of the four can have 10 possible for each. That results in 9x10x10x10 = 9000 possible 4 digit numbers. If, however, you can not use the same number twice in completing the 4 digit number, and the first digit cannot be 0, then the result is 9x9x8x7 = 4536 possible 4 digit numbers. If the 4 digit number can start with 0, then there are 10,000 possible 4 digit numbers. If the 4 digit number can start with 0, and you cannot use any number twice, then the result is 10x9x8x7 = 5040 possilbe 4 digit numbers.
2
Six - assuming 0123 does not count ... 1234 2345 3456 4567 5678 6789
0123 or 1234
Assuming that you are able to use all four digits as many times as you wish, then there are a total of 256 different numbers available. 4 choices for the first digit, 4 for the second, 4 for the third and 4 for the fourth. 4 x 4 x 4 x 4 = 256If each may only be used once, then the total will be just 24. 4 choices for the first digit, then 3 for the second digit and two for the third digit. The fourth digit will always be the single choice of the remaining digit, so the calculation will be 4 x 3 x 2 x 1 = 24.
12 numbers
3 digit numbers are lessthan 4 digit numbers
24 = 4*3*2*1
If you want 4-digit numbers, there are 24 of them.
5040
0132 or 1234 0123 or without 0 at front = 1023
106------------------------------------------------------------------------------------------------From Rafaelrz.You can make, 4P3 = 4!/(4-3)! = 24, different 3 digit numbers using 1, 2, 3 and 4.
4*4*4 = 64 of them.