Mathematics, 05.07.2021 09:50 diamondalize21p84czi

Problem 11: six friends who enjoy tennis decide to play a game of singles and a game of doubles every day of the 7-week school holidays a) Show that at least four of the games of singles will be between friends playing each other for the fourth time.
b) Show at least four of the games of doubles will be between pairs playing the same opposing pair for the second time.

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