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Re: doubt of numbers
by rakshit surana - Monday, 23 July 2012, 12:43 PM
  hi harendra, i think u did a lil mistake
since 2p +1 u have taken p will take all values including 0
p+q+r = 10
no of non negative solutions is C(n+r-1, r-1)
so C(10+3-1, 3-1)
C(12,2) which is equivalent to my previous solution