In an attempt to solve this problem you have to read "5 Cards Magic Trick" first.
Then here is the Challenge:
Can the "5 Cards Magic Trick" still be performed under the conditions below?
1. The trick is done with 2 mixed packs of cards (meaning, each card appears twice)
2. When the cards are given to Magician B at least one of them must be face down and he mustn't look at it.
Note: the conditions are simultaneous
(In reply to re: Corection To The Problem!!! Please Read
Charlie, I believe that your modification to my solution of the 1 deck trick could work with N decks. In fact I would say that it makes the trick even easier by adding extra decks and allowing 1 or more to be face down. If there are 2 or more identical cards among the 5 then simply discard one of the identical cards and place all but its twin face down, that will signal magician B that the face up card is exactly the card that was discarded. Now if not, then all 5 cards are different and we can use the previous method with the slight modification given by Charlie.
Posted by Daniel
on 2009-06-01 21:58:35