Let us say, for the sake of argument, that the plotter and the assassin are one and the same person.

为了便于展开讨论，让我们假设密谋者和行刺者是同一个人。

Assume for the sake of argument that there are no twins, that every birthday is equally likely, and ignore leap years.

假设这人群中没有双胞胎，所有人的生日概率都相等，并且排除掉闰年的存在。