10
11
6 12 9 18 15 30 27 54 51
It is 129.
The series seems to be "add 3," so the next number in the series would be 12 followed by 15.
The next number could be 26 The next number could be 12 - - - - - - - - - The next number that is in the sequence is 12.
The next number in the sequence is 48.
8, 11, 12, 15...............
5
Ten.
The next number in the sequence would be 25.
65 (each jump is 3, 6, 9, 12, 15, 18, etc)
What would be the next number in this series 15 12 13 10 11 8?