How many friends and enemies are in a group

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Question: Use Exercise to show that among any group of 20 people (where any two people are either friends or enemies), there are either four mutual friends or four mutual enemies.

Exercise: Show that in a group of 10 people (where any two people are either friends or enemies), there are either three mutual friends or four mutual enemies, and there are either three mutual enemies or four mutual friends.

Reference no: EM131571498

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