A round-robin tennis tournament consists of each player playing every other player exactly once.  How many matches will be held during an 8-person round-robin tennis tournament?
Question:
A round-robin tennis tournament consists of each player playing every other player exactly once.  How many matches will be held during an 8-person round-robin tennis tournament?
Answer:
Let's think step by step.

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A round-robin tennis tournament consists of each player playing every other player exactly once.  How many matches will be held during an 8-person round-robin tennis tournament?
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