GMAT
题目
The probability of Team X beating Team Y is . The probability of Team X beating Team Z is . Team X plays one game with Team Y and one game with Team Z.
Quantity A
The probability that Team X wins both games
Quantity B
The probability that Team X loses both games
解析
X击败Y的概率 = 2/3
X击败Z的概率 = 1/4
A项
X两场全胜：2/3 × 1/4 = 1/6
B项
X两场全负：1/3 × 3/4 = 1/4
B项 > A项
答案：B
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