1,1,2,4,7,11,16 ..... What is the next number of this series?

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• A 22
• B 21
• C 20
• D 19

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Answer: A. 22

1 + 0 = 1. 1+1=2 2+2=4 4+3=7 7+4=11 11+5=16 16+6=22.

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