763920
500
It is 120 if the digits cannot be repeated.
9x8x7x6x5x4x3x2x1 or 9! which equals 362880 possible combinations if no digits are repeated
Only one. 123456.
98,764
987,653
There is only one number and that is 123456.
The greatest 4-digit number with no repeated digits is... 9876
98,764
2000
94205 if digits are not to be repeated and 99999 if digits can be repeated
763920
9876543.
987653
987,654
98,764