163248

First of all, if any of the 2 numbers given is even, the first digit will be 9 as any 3 digit number starting with 9 will be larger than any 3 digit number starting with another digit. Then put the even number as the last digit, or if both other numbers are even put the smallest number as the last digit. If both digits are odd, make the last digit 8 as it is the largest even number and put the other 2 odd digits in descending order as the first and second digits.