15 points and for correct answer in a small chess tournament, 20 matches were played. find out how many people were involved if it is known that each participant played 2 games with every other participant in the tournament.

The answer is 10.

Step-by-step explanation:

There would be 10 players, 2 for each group, and if each player played every other player twice, then that would mean that 20 matches of chess were played.

Hope this helped!! (:

step-by-step explanation:

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