Monty Hall Problem Simulator

gistfile1.rb

trials = 100_000
results = trials.times.reduce({ :change_successes => 0, :keep_successes => 0 }) do |memo, i|
  doors = [nil]*3
  doors[rand(3)] = "car"
  choice = rand(3)
  if doors[choice] == "car"
    memo[:keep_successes] += 1
  else
    memo[:change_successes] += 1
  end

  memo
end


puts "Change success: #{100 * (results[:change_successes] / trials.to_f)}%"
puts "Keep success: #{100 * (results[:keep_successes] / trials.to_f)}%"

# Change success: 66.609%
# Keep success: 33.391%