娇娇打开作业本非常惊讶!题目:盒子里有同样大小的红球、黄球和绿球各10个。每次至少摸到多少个球,才能保证其中必有2个红球?答:每次至少摸到4个球。竟然错了!娇娇又把题目看了一遍,自言自语道:“没有错呀,书上也是这样说的:只要摸出的球数比它们的颜色种数多1,就能保证有两个球同色。怎么错了呢?唉!只有问老师了!”娇娇告诉老师她不知道这题错在了哪里。老师没有直接回答她,而是 Jiaojiao open homework very surprised! Title: the box has the same size red ball, yellow ball and green ball of the 10. How many balls do you touch each time to ensure there will be two red balls? A: Each touch at least 4 balls. Jiaojiao title read again, said to himself: “No mistake ah, the book is also said: as long as the number of touch out of the ball more than one of their color species, we can guarantee There are two balls of the same color. How wrong? Alas! Only asked the teacher! ”Jiao Johnson told the teacher she did not know where this problem is wrong. The teacher did not answer her directly, but instead