GMAT
题目
A bag contains 6 blue marbles and 4 red marbles. Two marbles are selected at random, one after the other (the first marble is not replaced in the bag after it is drawn).
Quantity A
probability of drawing 2 blue marbles
Quantity B
probability of drawing 2 red marbles
解析
2个蓝色——6/10×5/9=0.33
2个红色——4/10×3/9=0.1333
因此量A更大
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