[ExI] Intermittent liar puzzle #3 and #4

[Adrian Tymes]

On Mon, Jan 24, 2011 at 8:30 AM, spike <spike66 at att.net> wrote:
> ... On Behalf Of The Avantguardian
> ...
> Now here's one another one for you guys:
>
>>Fred shows you two boxes- one that is red and one that is blue - and you
> may choose to take either. You know one of the boxes contains an explosive
> boobytrap and the other contains a million dollars cash but you don't know
> which box is which. You also know that Fred always lies or always tells the
> truth on alternate days. You are allowed to ask Fred only one question. How
> do you get the million dollars?  Stuart LaForge
>
> "Fred, if I had asked you yesterday 'which box has the bucks?' which would
> you have told me?"
>
> The box he indicates will be the bomb, so you take the other one.

Assuming he hasn't switched the boxes' content since yesterday.