36128

To make 8 you can use o and 8, 1 and 7, 2 and 6 and 3 and 5. You can't have 4 and 4 because there is only one 4, you can't have 5 and 3 because you already have 3 and 5, you can't have 6 and 2 because you already have 2 and 6, you can't have 7 and 1 because you already have 1 and 7 and you can't have 8 and 0 because you already have 0 and 8. That means that there are 4 possible answers.