\sum_{j=1}^n a_{ij}=1\ \ \ (i=1,2,\cdots n)
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Recent Referers:
  1. http://formula.s21g.com/?%5Csum_%7Bj%3D1%7D%5En%20a_%7Bij...
  2. http://formula.s21g.com/
  3. http://blog.s21g.com/articles/2012.8
  4. http://blog.s21g.com/?page=7
  5. http://blog.s21g.com/?page=6