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题目一个坛中有m个小红球和n个小黑球,除了颜色不同外。其它没有任何区别,现有m+n个人依次从坛中取一个球,求第k((?)≤k≤m+n且k∈N)个人取的是红球的概率。
Topics There are m red balls and n small black balls in an altar, with the exception of the colors. There is no other difference. The current m+n individuals take a ball from the altar one by one. Find the probability that the k ((?)≤k≤m+n and k∈N) individuals take the red ball.