(矩陣)設A、B二箱，A箱內有兩球，一黑一白，B箱內有一白球。甲、乙二人輪流取球，每次先由甲自A箱內任取一球，放入B箱，再由乙箱自B箱內任取一球，放入A箱內，這樣稱為一局。那麼當那一局結束時，A箱內兩
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