21, 26, 19, 24, (), (), 15, 20 what do you fill in the brackets?

21, 26, 19, 24, (), (), 15, 20 what do you fill in the brackets?

21、26、19、24、(17)、(22)、15、20
Jump to see, 1 3 5 7, 2
2 4 6 8 difference 2