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  If A = {1,2,3,4....18,19} then the number of functions f : A→A such that f(x)=y and sum of digits of x is equal to the sum of digits of y is (a) 540 (b) 219 (c) 218 (d) 720 ...
  0·4· #Mathematics#Algebra#Combinatorics
  replied2014-03-31 00:56:00