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Prove that every regular tournament is strong.

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Here we need to first figure out something more about outdegrees and indegrees and orders of regular digraphs. Try to find a regular digraps with 3, 4, 5 ,6 vertices, and generalize.

D is a regular tournament if there is k such that outdegree x = k and
indegree x = n-k-1 for every x in D.

Please can you explain what does regular tournament strong mean?

Can you give a graph or graphs.

Explain this problem step by step.

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