Question: If the two pans do not balance, remove the lighter group and set it aside. The fake coin must be in the lighter group,

"If the two pans do not balance, remove the lighter group and set it aside. The fake coin must be in the lighter group, but we don't know yet if it's lighter or heavier." In this step, how do you know that the fake coin is in the lighter group? Why can't it be in the heavier one?

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