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标题: GWD19~Q16~概率问题~ [打印本页]

作者: chchencheng    时间: 2011-8-12 06:57     标题: GWD19~Q16~概率问题~

M = {-6, -5, -4, -3, -2}
T = {-2, -1, 0, 1, 2, 3}
If an integer is to be randomly selected from set M above and an integer is to be randomly selected from set T above, what is the probability that the product of the two integers will be negative?

答案是1/2。
我做出来是2/5,肯定是方法有问题了。
请NN帮忙,谢谢~

作者: rockstonexS    时间: 2011-8-12 20:01

满足条件的个数:5X3=15
总个数5X6=30
作者: chchencheng    时间: 2011-8-14 07:43

好的,谢谢!




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