Find out the rule of number arrangement 2,5,7,4,7,5,3,6,? Find out the law of number arrangement 2,5,7 4,7,5 3,6,?

Find out the rule of number arrangement 2,5,7,4,7,5,3,6,? Find out the law of number arrangement 2,5,7 4,7,5 3,6,?

six
The first column (2 + 4) / 2 = 3
The second column (5 + 7) / 2 = 6
The third column (7 + 5) / 2 = 6
It's all the first two, divided by two, and it's the third