Find the law: half, five sixths, eleven twelfth, (), ()

1/2,5/6,11/12,19/20,29/30

1、 One half, one third, one, one ninth, two, (), ()
It's to fill in the numbers regularly,

You put forward items 1, 3 and 5, that is: one, one third, one ninth, that is, 1,1 / 3,1 / 9,
Each one is multiplied by 1 / 3 of the previous one, so item 7 is 1 / 27
Items 2, 4 and 6 are put forward, that is: half, one, two, that is, 1 / 2, 1,2,
Each one is multiplied by 2 from the previous one, so item 8 is 4

1、 One half, one third, one, one ninth, two () () rule

1,1/2,1/3,1,1/9,2,(1/27),(4)
Double sequence
Odd number sequence 1,1 / 3,1 / 9,1 / 27. Is an equal ratio sequence with a common ratio of 3, that is, the ratio of the former term to the latter term is 3
Even number sequence 1 / 2,1,2,4. Is an equal ratio sequence with a common ratio of 1 / 2, that is, the ratio of the former to the latter is 1 / 2

Find the law: half, five sixths, eleven twelfth, (), ()