Saturday, November 10, 2012

0, 1, 2, 4, 6, 9, 12, 16, ?


0, 1, 2, 4, 6, 9, 12, 16, ?

What number should replace the question mark?



Puzzle Answer

Answer:

20: add 1, 1, 2, 2, 3, 3, 4, 4.
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