Originally Posted by Hraesvelg
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Are you wondering about the math bit? It's because you started with 0 (empty), you added 2, subtracted 3, and need to add another one to get it back to 0.
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But, how do you not know that there was someone already in the building; Going from 1 + the 2 that entered = 3 then - 3 would equal 0, then another 1 would make 1...
The joke didnt say the building was empty.