3 : 4 - Ratio of white tennis balls to orange tennis balls, 7 : 4 - Ratio of the total number of tennis balls to orange tennis balls, 4 : 3 - Ratio of orange tennis balls to white tennis balls, 3 : 7 - Ratio of white tennis balls to the total number of tennis balls, 1 : 7 - Wrong choice a, 3 : 10 - Wrong choice  b,

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