All about flooble | fun stuff | Get a free chatterbox | Free JavaScript | Avatars
 perplexus dot info

 Prediction (Posted on 2015-11-02)
Arrange cards with values ace through 9 in a row, in counting order, with the ace on the left.
Take up a card from one end of the row — left or right, your choice.
Do this twice more, each time taking up either the leftmost or the rightmost card in the remaining row.
Now you have three cards. Add their values, divide the total by six, and call the result n.
Consider the order of the cards that remain on the table.

The card in the nth position (counting from left to right) will be the 4.

Please explain why.

 No Solution Yet Submitted by Ady TZIDON No Rating

Comments: ( Back to comment list | You must be logged in to post comments.)
 re: Solution and a follow-up Comment 2 of 2 |
(In reply to Solution and a follow-up by Jer)

The word author is not the right word in this case, it is a well known

self-producing trick.

Re your remark, - any generalization is always welcome!

 Posted by Ady TZIDON on 2015-11-02 14:23:31
Please log in:
 Login: Password: Remember me: Sign up! | Forgot password

 Search: Search body:
Forums (0)
Newest Problems
Random Problem
FAQ | About This Site
Site Statistics
New Comments (12)
Unsolved Problems
Top Rated Problems
This month's top
Most Commented On

Chatterbox:
Copyright © 2002 - 2022 by Animus Pactum Consulting. All rights reserved. Privacy Information