give the two missing numbers in the following sequence16 9 18 7 () () 22 3

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give the two missing numbers in the following sequence
16 9 18 7 () () 22 3

(20)(5),第1、3、5、7位分别为16,18,20,22,相差为2,同样,第2、4、6、8位分别为9,7,5,3,相差也为2.

The 1st, 3rd, 5th and 7th are 16 18 () 22
so, the 5th number is 20
The 2nd, 4th, 6th and 8th are 9 7 () 3
so, the 6th number is 5
The two missing numbers are 20 and 5