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Nov 18th, 2017
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  1. #Lattice paths
  2.  
  3. def fact(n)
  4. if (n==1)
  5. return 1
  6. end
  7. return n*fact(n-1)
  8. end
  9.  
  10. def numPaths()
  11. p fact(40)/(fact(20)*fact(20))
  12. end
  13.  
  14. numPaths
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