A mathematician, a biologist and a physicist are sitting in a outdoor cafe, talking with each other and people watching.
They see two people walking along, who then go into a house just across the street. Time passes. After awhile they notice three persons coming out of the house.
The physicist says, "The measurement wasn't accurate."
The biologist says " No! They have reproduced".
And the mathematician says, "If now exactly one person enters the house then it will be empty again."
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