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or to make it more clear...
You pick up cup A and don't look inside. Now you know that you have the cup that contains either $2X or $X. Should you switch? The answer is clearly that it doesn't matter, because the other cup either contains $X or $2X! And even if you were to look inside cup A and see it contained $1, this should not change the logic one bit.
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oh baby oh baby, i like gravy.
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