Question: There are 10 students in a class. If a singles tennis game is played in a round robin fashion with every student playing an opponent

There are 10 students in a class. If a singles tennis game is played in a round robin fashion with every student playing an opponent twice, how many possible tennis matches are to be conducted?

I. 100

II. 3,628,800

III. 725,760

IV. 45

V. 90

VI. 10

I II III IV V VI

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