In the old game of Operation, the surgeon/player could earn $100 by removing Butterflies in the Stomach, an actual butterfly from the patient’s torso.   But there’s no need to feel butterflies when you see a strange operation defined for the symbol:  ¶.

I like to tell my students they can define any symbol to represent any operation they can dream up.

a \odot b = a-b+17

a \star b = -37

This AMC problem adds a bit of complexity as it’s an operation that is defined for 3 inputs.


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