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In each group the middle number is the square of the difference of the other two. We have $$(12 - 5)^2 = 49$$, $$(13 - 8)^2 = 25$$ and $$(11 - 3)^2 = 64$$. But $$(14 - 4)^2 = 100 \neq 36$$, so (14, 36, 4) is the odd one out.
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