Hierarchical
4人参加乒乓球比赛，每2人对战一场，甲战胜乙的概率是0.4，乙战胜丙的概率是丙战胜丁概率的2倍。已知乙在比赛中对甲、丙均取胜的概率是0.18，问丙战胜丁的概率为？ (水城百事)
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