No point on changing the door

doors.rb

prng = Random.new

on_3 = 0
on_2 = 0
on_1 = 0
total = 100000
partial = 0
total_changes = 0
correct_after_change = 0
wrong_after_change = 0
correct_without_change = 0
wrong_without_change = 0

(1..total).each do |i|
  door = []
  door[0] = false
  door[1] = false
  door[2] = false
  door[prng.rand(0..2)] = true


  #selected = prng.rand(0..2)

  selected = 0
#  puts "Door selected is #{selected + 1}"

  if door[2]
    on_3 += 1
  else
    partial += 1
    if door[1]
      on_2 += 1
    else
      on_1 += 1
    end
    change = prng.rand(0..1)
    if (change == 1)
      total_changes += 1
      selected += change
#      puts "changed selection"
    end
    
    if door[selected] && change == 1
      correct_after_change += 1
    elsif !door[selected] && change == 1
      wrong_after_change += 1
    elsif door[selected]
      correct_without_change += 1
    else  
      wrong_without_change += 1
    end
  end
end

puts "on door 1: #{on_1}"
puts "on door 2: #{on_2}"
puts "on door 3: #{on_3}"
puts "percentage on door 1: #{on_1 * 100.0 / total}"
puts "percentage on door 2: #{on_2 * 100.0 / total}"
puts "percentage on door 3: #{on_3 * 100.0 / total}"
puts ""
puts "correct after change: #{correct_after_change}"
puts "wrong after change: #{wrong_after_change}"
puts "correct without change: #{correct_without_change}"
puts "wrong without change: #{wrong_without_change}"
puts ""
puts "total changes: #{total_changes}"
puts "percentage changes: #{total_changes * 100.0 / partial}"
puts ""
puts "percentage on correct after change: #{correct_after_change * 100.0 / partial}"
puts "percentage on wrong after change: #{wrong_after_change * 100.0 / partial}"
puts "percentage on correct without change: #{correct_without_change * 100.0 / partial}"
puts "percentage on wrong without change: #{wrong_without_change * 100.0 / partial}"
puts ""
puts "percentage of changes correct: #{correct_after_change * 100.0 / total_changes}"
puts "percentage of changes wrong: #{wrong_after_change * 100.0 / total_changes}"
puts "percentage of no changes correct: #{correct_without_change * 100.0 / (partial - total_changes)}"
puts "percentage of no changes wrong: #{wrong_without_change * 100.0 / (partial - total_changes)}"