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Attention: Calling All Problem Solvers!

Series teasers are where you try to complete the sequence of a series of letters, numbers or objects.

 

Puzzle ID:#37235
Fun:*** (2.16)
Difficulty:*** (3.08)
Category:Series
Submitted By:dunchen22Aus****!
Corrected By:luckythirteen

 

 

 



What comes next in this series:

11, 31, 22, 21, 10, 31, 12, 40, 20...





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