Part of a set of 6 images for use in illustrating the "Monty Hall problem".
<p>No machine-readable author provided. <a href="//commons.wikimedia.org/wiki/User:Father_Goose" title="User:Father Goose">Father Goose</a> assumed (based on copyright claims).
</p>
 incorporating elements from the PD work <a href="//commons.wikimedia.org/wiki/File:Monty_open_door.svg" title="File:Monty open door.svg">File:Monty open door.svg</a> by <a href="//commons.wikimedia.org/wiki/User:Cepheus~commonswiki" title="User:Cepheus~commonswiki">Cepheus~commonswiki</a>
No machine-readable source provided. Own work assumed (based on copyright claims).