123
There are 3 values (1, 2, 3) for each of the 4 digits. Therefore, there are 3*3*3*3 or 81 four digit numbers that can be formed.
3! = 1 x 2 x 3 = 6. The same for any three different digits - you have 6 possible combinations. * * * * * NO! That is the number of permutations! In a combination the order of the numbers does not matter, so there is only one combination 123. And that is the same as 132, or 312 or ...
In general an n-gon has n sides. Therefore, a 123-gon would have 123 sides.
Two.Two.Two.Two.
it would be 0000.01
With 123 digits you can make 123 one-digit numbers.
123
123
123
321 312 213 231 123 132 6 3 digit numbers.
9876 - 123= 9753
1+2+3=6 1x2x3=6 123
123, three number 45, two number
it would be 321 312 231 213 123 132
1 as in 100 2 as in 20 3 as in 3
6 - 123, 132, 213, 231, 312, and 321.