15名基督*和15名异*同乘一船航行，途中风浪大作，危机万分，领航者告诉大家，只要将全船的一半人投入海中，其余人就能幸免。大家都同意这个办法，并协定者30人围成一圈；由第一个人起报数，每数至第9人便把他投入海中，下一个接着从1开始报数，第9人又被投入海中，依次循环，直至剩下15人为止。问题是如何排法使投入海中的人全为异*？-15 Christians and pagans 15 by a ship with navigation, the way to big storms, extreme crisis, leader to tell you, just half of the entire ship into the sea, and the remaining people will be able to escape. We all agree with this option, and agreements were 30 circle　by the first reported from a number of individuals, each a few to 9 people put him into the sea, the next and then from 1 to start off, 9 people have been invested in the sea, followed by cycle, until the remaining 15 people so far. The question is how to row into the sea law so that people all infidels?