648
9876543210, without using any mathemeatical operations.
24
60
I think the answer is: 976542
The answer is 3*3*2*1 = 18. If the leading digit is 0 it is not a 4-digit number.
9876543210
9876543210, without using any mathemeatical operations.
24
18, if leading 0s are disallowed.
60
468, 486, 648, 684, 846, 864.
4 x 3 x 2 ie 24
I think the answer is: 976542
The answer is 3*3*2*1 = 18. If the leading digit is 0 it is not a 4-digit number.
With repeating digits, there are 33 = 27 possible combinations.Without repeating any digits, there are 6 combinations:357375537573735753
20. 16 without repeating a digit.
1023459