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Theorem (Erdos 1963) If ()(1-k)<1 then there is a k-paradoxical tournament of n players. Pick a random tournament T on n players [n]. Event As:no player in \S beat all players in S. Pr[As]=(1-2k)-If ￾n k ⇥ ￾1 ￾ 2￾k⇥n￾k < 1 then there is a k-paradoxical tournament of n players. Theorem (Erdős 1963) Pick a random tournament T on n players [n]. Fixed any S ￾ ￾[n] k ⇥ Event AS : no player in V \S beat all players in S. Pr[AS] = ￾ 1 ￾ 2￾k⇥n￾k
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