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5 votes
1+4 =5, 2+5=12, 3+6=21 then 8+11 ...

User Rochel
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2 Answers

3 votes
The answer to 8 + 11 is 19
User Mcuenez
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5 votes
you take the 5 from the first part and add it to the 2+5.  This gives you 12.  Then take the 12+(3+6) and this gives you 21.  21+(8+11) and you get 40.
User Russell Mull
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