請教：Counting-off Puzzles

來源: 於 2012-06-18 19:44:30 [舊帖] [給我悄悄話] 本文已被閱讀：次

這樣的問題有規律可尋嗎？

25 people are standing in ca circle. Starting with person 1, they count off from 1 to 7 and them start over with 1. Each person who says"7" drops out of the circle. who is the last person left?