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deck o' cards


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#1 Ploper

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Posted 20 November 2007 - 02:25 AM

I just edited this one to add:
YAY! ANOTHER PUZZLE I CREATED...

I did this one with a normal 52 card deck of cards.
I got three different answers, but the final one I triple checked so i'm fairly confident....

Draw an X on the back of one of your cards, it'll be easier to do this.
put the card with the X on it on the top of the deck.
On your first turn, move the top card to the bottom of the deck.
On you second turn, move the top two cards to the bottom of the deck
On your third turn, move the top three cards to the bottom of the deck and etc. etc.

After how many turns will the card with the X on it be back on top of the deck?
Be sure to put the cards to the bottom of the deck in the same order.
So when you're done, the cards will be in the same order that you started in...

Now I can cheat when I play cards!
The 7 of hearts has an X on the back...
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#2 Writersblock

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Posted 20 November 2007 - 05:59 AM

On the 26th try you will have moved 51 cards, making the bottom card the top card.
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#3 bonanova

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Posted 20 November 2007 - 07:26 AM

Spoiler for solution

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The greatest challenge to any thinker is stating the problem in a way that will allow a solution.
- Bertrand Russell

#4 Ploper

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Posted 20 November 2007 - 11:54 PM

thanks.
Yep, they were kinda sore...
I actually did it five times but I screwed up on two of them
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