Set Theory and Logic

    

A Logical Problem

Authors: Elmar Guseinov

Alpaca (A), Bull (B), Cat (C), Dog (D), Elephant (E) and Fox (F) inhabit each of three planets. Each of sixty people visited each of the planets and made friends there with exactly two inhabitants. It's known that the new friends of a person formed the whole set {A,B,C,D,E,F}. Also, any two inhabitants of different species living on different planets have exactly eight mutual human friends. For each person, determine with which inhabitants of each of the planets he is friends.

Comments: 1 Page. In Russian

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[v1] 2023-01-04 02:31:42

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