GMAT
题目
There are exactly 13 coins in a bag: 4 pennies, 2 nickels, 3 dimes, and the rest are quarters. One coin is selected at random from the bag.
Quantity A
A: The probability that the selected coin is a quarter
Quantity B
A: The probability that the selected coin is a penny
解析
首先，计算25美分硬币的数量：13-4-2-3=4枚。
A = 选中一枚25美分硬币的概率 = 4/13。
B = 选中一枚1美分硬币的概率 = 4/13。
A=B，因此答案为C。
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