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The series seems to be "add 3," so the next number in the series would be 12 followed by 15.
Atari recently asked the RCT forums what they would like in the next installment of the series, so as of now, it looks like we may see RCT4.
They would both be 25.
next would be 71 and then after it would be 63.
Yes usuallly it would say something like about coming next or which book was earlier
The next of an octahedron looks like a series of 8 triangles.
Smells like treasure
What would be the next number in this series 15 12 13 10 11 8?
THE NEXT IS SWORD AND SHIELD THE SERIES IN 2020
It is called Lego Hero Factory.
meet the spartans!!
Probably, if there is it would be September next year.