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数学魔术：找出你喜欢的数字
观众每一次都从1——9中选择一个数，共选择10次，并将它们依次相乘，再把乘积中最喜欢的数字记下来，最后把其它数字打乱顺序后报给魔术师。然而这似乎难不倒魔术师，他总能准确找出观众最喜欢的那个数字，这里藏着什么数学原理呢？
小学生喜欢的数学魔术43/115
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