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The ten basketball teams in a league play a round robin tournament. Every team plays every other team once, and no game ends in a tie. What can be said about the sum of the number of wins for all ten teams?

A

The sum can vary depending on the results of the games.

B

The sum must equal 100.

C

The sum must equal 90.

D

The sum must equal 81.

E

The sum must equal 50.

F

The sum must equal 45.

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