what two number complete

7 9 8 10 ___ ___ 10 12

2 answers

The above series is a combination of two series,
7,8,9,10,11
and
8,9,10,11,12.

The series can be filled as 7 9 8 10 _9__ __11_ 10 12
The pattern is +2, -1. The missing numbers are 9 and 11.