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Mouse Puzzle

Give a bite of cookies 1 and 2 to mouse A and a bite of cookies 2 and 3 to mouse B. Don’t feed cookie 4 to either mouse.

Which cookie is the special one?

If only mouse A turns pink, it’s cookie 1.
If only mouse B turns pink, it’s cookie 3.
If both mice turn pink, it’s cookie 2.
If neither mouse turns pink, it’s cookie 4.

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