The Puzzled Postman

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Mr. Kowalski was expecting a package, so he tacked the following note to his door:

 

Mr. Postman,

The doorbell to my apartment doesn't work. If you want to leave a package, use the knocker.

If nobody answers, ring the doorbell of my neighbor next door. If no one answers there, try my sister's at apartment 2.

 

When the postman arrived with the package, he found that the note had fallen to the floor, and he couldn't tell which door it had been pinned to. Nevertheless he was able to deliver the package correctly.

Which apartment is Mr. Kowalski's?

If you need to peek at the answer, click here.

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Last updated October 10th, 2003