You are blind. You have 2 blue pills and 2 red pills in a box.
You have to take 2 pills today and 2 tomorrow. Each day, exactly one blue and one red. If you don’t, you will die. If you take more, you will die.
How do you do it ?
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One by one, you take the pill, break it in half, eat a half and keep the other half for tomorrow. This way, you will eat exactly 1 blue and 1 red pill per day.