12 12 Series Completion Series Completion What comes next in each of the series given below? 1. 2 4 6 8 10 12 __ 2. 9 8 7 6 5 4 __ 3. 0 5 10 15 20 25 __ 4. 34 35 36 37 38 39 __ 5. 3 6 9 12 15 __ 54 54