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[" A bag contains a white and "b" black ...

[" A bag contains a white and "b" black balls.Two players "],[A" and "B" alternately drawn a ball from the bag,replacing "],[" the ball each time after the draw till one of them draws a "],[" white ball and wins the game.A begins the game.If the "],[" probability of "A" winning the game is three times that of "],[B" ,the ratio "a:b" is equal to "],[[" (a) "1:2," (b) "2:1," (c) "1:1," Id) "2:3]]

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