monty hall style problem

gistfile1.rb

switch = 0
stay = 0

100_000.times do
  doors = [ :goat , :goat , :goat , :car ].shuffle
  
  guess = rand doors.size
  
  if doors[guess] == :car
    stay += 1
  else
    doors.delete_at guess
    doors.delete_at doors.index(:goat)
    new_guess = rand(doors.size)
    switch += 1 if doors[new_guess] == :car
  end

end


# switch  37%
switch # => 37489

# stay    25%
stay   # => 25000