S2S2, S2S3 Misc4 and 4c Solutions for selected questions Posted by chtanmaths — March 21, 2012 8:02 pm 2 Others in ppt files : ex4 misc ex4c
4个1和3个2的排法（不能两个2在一起） Posted by chtanmaths — May 11, 2011 7:34 pm 0 三餐1陈彦颖问的一个问题 其作法同以下链接类似： http://chtanmaths.wordpress.com/2011/05/07/triangle%e6%b2%a1%e6%9c%89%e4%b8%a4%e4%b8%aa%e6%af%8d%e9%9f%b3%e5%9c%a8%e4%b8%80%e8%b5%b7%e7%9a%84%e5%85%a8%e9%83%a8%e6%8e%92%e6%b3%95/
