8 9 6        No digits are correct.
3 5 0        One digit is perfect and
                one digit is misplaced.
3 5 7        One digit is perfect.
3 2 7        One digit is perfect.
3 2 0        One digit is perfect and
                one digit is misplaced.
3 7 0        One digit is perfect and
                one digit is misplaced.
1 7 0        Two digits are misplaced.