There are three cards numbered 1, 2 and 3. Randomly draw two cards among them without replacement. Let X, Y represent the number of the 1st and 2nd card, respectively. The marginal p.(x) and p,(y) respectively are O 1/6, 1/6 O 1/2, 1/2 O 1/4, 1/4 1/3, 1/3

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A: Here use basic probability rule

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A: Use congruent property

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