单选题
从前100个正整数中选出两个数a和bQuantity A: the probability that both a and b are even integersQuantity B: the probability that (a+b) is even integer
A、
Quantity A is greater.
B、
Quantity B is greater.
C、
The two quantities are equal.
D、
The relationship cannot be determined from the information given.
【正确答案】
B
【答案解析】
偶数=偶数+偶数=奇数+奇数，所以a+b为偶数的概率=a，b同为奇数的概率+a，b同为偶数的概率，因此选择B。
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