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Now, as a final epilogue, I have here a copy of a letter written by Monty Hall himself

in 1990 to Professor Lawrence Denenberg of Harvard

who, with Harry Lewis, wrote a statistics book

in which they used the Monty Hall Problem as an example,

and they wrote to Monty asking him for permission to use his name.

Monty kindly granted the permission, but in his letter,

he writes, "As I see it, it wouldn't make any difference after the player

has selected Door A, and having been shown Door C--

why should he then attempt to switch to Door B?

So, we see Monty Hall himself did not understand the Monty Hall Problem.