The 5th digit could not be 7 or 9 because of rule #3
It has to be odd, therefore it could be 1, 3 or 5
If 5th digit of 5, last 2 digit is 58
Multiples of 58 which are 2 digits is only 58
But since the six digits should be unique, 58 could not be the last 2 digits.
If 5th digit is 3, last 2...