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Answer:  8  7  6
The first hint indicates numbers 1,2,3 are not in the combination.
By joining the first and third hints we deduce that number 6 is part of the combination.
The second hint indicates that 6 is the third number in the combination and numbers 4 and 5 are not in the combination.
The last hint indicates that 8 and 9 are in proper order.
But 9 is impossible beacause 6 is already in that place.
Therefore 8 is the first number of the combination.
Hint four indicates that 7 is the second number of the combination.

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