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Challenge about refrigerators

Recently, all kinds of logical tasks are popular in Habré. Some of them are very complex and kill a lot of time. One of my friends came up with a small task that does not require straining mathematical thinking, although it kneads Mosk well.

There are three rooms with absolutely identical initial thermodynamic and other parameters (volume, temperature, pressure, humidity, etc.). In each room there are absolutely identical refrigerators. In the first room, the refrigerator does not work; in the second room it works with the door closed, and in the third it works with the door open.

The initial temperature in all rooms is + 20º
')
Question: which room will be warmer after an infinitely long period of time and why? there is no ventilation in the rooms - they are airtight.

Source: https://habr.com/ru/post/21088/


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