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The differences between a number and the number two on is alternating between 6 and 3. In this case, the next number will be 24 + 6 = 30.
11
11.
24
The number 7 comes next.
11 15 16
30!
8
18 9 11 14 7 9 12 the series is like 18/2= 9 9+2=11 11+3=14 14/2=7 7+2=9 9+3=12 so next number will be.. 12/2=6 then 6+2=8 8+3=11