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1+4=5,2+5=12,3+6=21,8+11=?
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1+4=5,2+5=12,3+6=21,8+11=?

User Phil Boltt
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Eight plus eleven is nineteen.
User Drew Johnson
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50, because 21 + 8 = 39 + 11 = 50
User Adam Sznajder
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