2. 外语
  3. 从前100个正整数中选出两个数a和b Quantity A: the probability that both a and b are even integers Quantity B: the probability that (a+b) is eve

从前100个正整数中选出两个数a和b Quantity A: the probability that both a and b are even integers Quantity B: the probability that (a+b) is eve

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问题 从前100个正整数中选出两个数a和b
Quantity A: the probability that both a and b are even integers
Quantity B: the probability that (a+b) is even integer
选项 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.
答案B
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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