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0+1=1;1+1=2;2+1=3;3+2=5;············;8+13=21;21+13=34;34+21=55. 55 is the answer.
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The number next in this series is 55 (21+34).
This is called the fibonacci sequence where the next number is found by adding the previous 2 numbers in the series.
Eg= 8 is 5+3.
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