This is the Monty Hall Problem, and though counter-intuitive, is well understood: https://en.wikipedia.org/wiki/Monty_Hall_problem https://en.wikipedia.org/wiki

This is the Monty Hall Problem, and though counter-intuitive, is well understood: https://en.wikipedia.org/wiki/Monty_Hall_problem https://en.wikipedia.org/wiki/Monty_Hall_problem