"Don Pearce" wrote in message
...
(First you MUST assume the coin is untampered with, you cannot assume the
same for a TV game show however!)

What has this to do with the question?

Nothing I guess for the specific case in question. As was pointed out there
is only one possible set of events if a switch is offered for a one of 3
game of chance. I admit to confusing this with other TV games where the host
can and does influence the outcome.

Trevor.