What is next in the sequence 1 10 3 9 5 8 7 7 9 6?

1+10 - 2 (2 is one less than 3, the next answer in the sequence) = 9.

10 + 3 - 8 (8 is one less than 9) = 5

3 + 9 - 4 = 8

etc...; so the next two numbers in the sequence will be 11 and 5.