Write the smallest 5-digit number that can be formed using 8, 9, 5, 7 and 1 without repetition.
The smallest number has the leftmost digit of least value and rightmost digit of highest value. 1 < 5 < 7 < 8 < 9, Hence the smallest number is 15789.
The smallest 5 digit-digit number that can be formed using 6, 2, 0, 1 and 9 without repetition is _______.
Find the smallest 5-digit number that can be formed using the digits 9, 6, 0, 5, 8 and 1.
(Note: Repetition of digits is not allowed)