IBM挑战2005年1月：七色珠链
一条闭串项链由35颗珠子组成，珠子的颜色共分7种。从7种颜色中选3种共有35种不同组合。请找出一种珠子安排，令这35种不同颜色组合在项链的每3颗相连珠子中恰好出现1次。
英文原文
Ponder This Challenge:
Puzzle for January 2005
Our New Years puzzle was submitted by John G. Fletcher,
who heard it from Marc Roth.
www.ddhw.com
A necklace is made up of 35 beads forming a closed loop, each bead being of one of 7 distinct colors. Find an arrangement for the beads such that every one of the 35 combinations of the 7 colors taken 3 at a time occurs exactly once as a set of 3 consecutive beads.
The first 100 people who answer correctly will be listed. The answer will be posted a week after the 100th is received, or at the end of the month.
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哈哈哈哈 O(∩_∩)O哈哈~ 好久不来了，不小心看了一眼自己主页，发现自动关联了自己以往发过的帖，点进这个看了一眼，笑个半死。。。敢情我当初还发过这么搞笑的东西啊，我自己完全不记得了 
雷达卡
发表于 2005-2-27 13:04:54
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