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Mathematics, 06.05.2020 08:24 SKYBLUE1015

10 teams enter a soccer tournament. In the first round teams paired in 5 pairs to play with each other. How many different pairings are possible neither the order of the pairings nor the order of teams within each pairing matters?

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10 teams enter a soccer tournament. In the first round teams paired in 5 pairs to play with each oth...
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