\sum_{n\neq m,a}\sum_{m\neq a} p_m\frac{p_n}{1-p_m}\frac{p_a}{1-p_m-p_n}
Embed the image to your blog in HTML, Markdown, Textile, BBCode.
Recent Referers:
  1. http://blog.goo.ne.jp/admin.php?fid=newentry