Monty Hall problem

• A TV show presents 3 doors to a candidate: 2 doors have a goat, 1 door has a brand new car.
• The candidate, chooses a door.
• The TV show presenter, opens 1 door with a goat.
• After opening this door, the candidate may choose another door.
• .. changing your initial choice, will boost your chanses to win!

• The program below calculates the 3doors and makes a random first random choice for the candidate.
• The program opens the other door with a goat.
• The program asks you to change your choice or keep your original door.