Monty Hall Problem

monty_hall.rb

@wins_sticky 	= 0
@wins_change 	= 0
@nb_parties 	= 1000
@possibles    = [0, 1, 2]

def play
  winner        = rand(3)  
  first_choose  = rand(3)
  others        = @possibles - [first_choose]
  discarded     = others.include?(winner) ? (others - [winner]).first : others[rand(2)]
  
  @wins_sticky +=1 if first_choose==winner
  @wins_change +=1 if (others - [discarded]).first==winner        
end
  
@nb_parties.times do
  play
end

puts "wins_sticky %  #{@wins_sticky.to_f / @nb_parties}"
puts "wins_change %  #{@wins_change.to_f/ @nb_parties}"

Mise en évidence de :
http://fr.wikipedia.org/wiki/Probl%C3%A8me_de_Monty_Hall