Rat & wine

You are provided with 13 bottles containing wine with same level and one bottle is poisoned. Now you have 4 rats. One of the 13 wine bottles, is poisoned. You want to determine which bottle is poisoned by feeding the wines to the rats. The wine takes 24 hours to kill, now you have 4 rats to test. Determine the poisoned bottled within 24 hours.

Author: Amit Khandelwal 1
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