From: Adrian Tymes (wingcat@pacbell.net)
Date: Mon May 14 2001 - 10:57:15 MDT
Jeff Davis wrote:
> Good work Adrian, but, I'm scratching my head, because it seems to me that
> you missed the one sequence that represents the original puzzle.
> Contestant chooses door. Host chooses a nonprize door from the unchosen
> two. Contestant switches from his first choice to the other unrevealed
> door.
>
> Am I missing something?
I was leaving that one out since I thought everyone already knew that
one, but since you asked...
Case E: Host reveals a door other than the one the contestant picked.
If the contestant picked a non-prize, host reveals the other non-prize,
and contestant switches (thus to the prize). If contestant picked the
prize, host reveals a random non-prize, and contestant switches to the
other non-prize.
Trial 1 2 3 4 5 Total WinRatio ExpectedWinRatio
CaseE 646 689 642 671 669 3371 0.6634 0.6666
sub do_strategy_e {
# host reveals a non-prize door
my ($picked,$prize) = @_;
if ($picked != $prize) {
# host never reveals contestant's door if
# contestant chose non-prize, so contestant switches
# to prize
return $prize;
} else {
# host reveals random other door if contestant
# chose prize, so contestant switches to the
# other non-prize
my $new_pick = pick_other_than($picked);
return $new_pick;
}
}
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