7 4 6 5
Solved in 2 ways.
#1
10 1 9 2 8 3 74 6 5
As you can see every second number relates to each other.
#2
10 - 9 = 1 + 8 = 9 - 7 = 2 + 6 = 8 - 5 = 3 + 4 = 7 - 3 = 4 + 2 = 6 - 1 = 5
You + and - with the number one lower than the one needed to make it. 7
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266
The next number in the sequence is 480
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10
The next number in the sequence is 27.