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不知道这个题目是不是有点问题

3261: Old Magician

546607389 | 2009-08-12 06:51:40 | delete | edit
After removing a pair of balls, 
Bob is asked to place a white ball back into the hat if they are the same color. 
Otherwise he is asked to place a black ball into the hat. 
这句话很主要,题里没说放回去的球一定在拿出来的球之中,第一次就拿出来两个黑球也要放回去一个白球的。

 
0643041042 | 2008-11-19 18:29:34 | delete | edit
非常玄...... 
ycy | 2008-11-19 12:59:22 | delete | edit
 

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