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Mathematics, 30.07.2019 17:20 SillyEve
In a group of people, friendship is symmetric—that is, if person x is friends with person y then person y must also be friends with person x. furthermore, no person is friends with themselves. suppose there are exactly seven people in this group, and that every person has at least four friends. prove that this group must contain three people who are all friends with each other.
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In a group of people, friendship is symmetric—that is, if person x is friends with person y then per...
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