Question 685643
Suppose five tennis players have made the finals. If each of the five players is to play every other player exactly once, how many games must be scheduled?
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Ans: 4 + 3 + 2 + 1 = 10
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Or
Ans: # of unique pairings = 5C2 = (5*4)/(1*2) = 10

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Cheers,
Stan H.