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• EQUATION!
  The number of non- negative integral solutions of x1+x2+x3+x4=20 with at least one of the xi ( i=1,2,3,4) is even is: (a) 1500 (b) 1470 (c) 1450 (d) 1606 ...
  0·29· #Mathematics#Algebra
  replied2010-06-29 13:14:29