Archive

This week

11/12/2010
11/05/2010
10/29/2010
10/22/2010
10/12/2010
10/05/2010
09/28/2010
06/15/2010
06/08/2010
06/01/2010
05/25/2010
05/18/2010
05/11/2010
05/04/2010
04/27/2010
04/20/2010
04/13/2010
04/06/2010
03/30/2010
03/09/2010
03/02/2010
02/23/2010
02/16/2010
02/09/2010
02/02/2010
01/26/2010
01/19/2010
01/12/2010
01/05/2010
12/08/2009
12/01/2009
11/24/2009
11/17/2009
11/10/2009
11/03/2009
10/27/2009
10/20/2009
10/13/2009
10/06/2009
09/29/2009
07/14/2009
07/07/2009
06/23/2009
06/02/2009
05/26/2009
05/19/2009
05/12/2009
05/05/2009
04/28/2009
04/21/2009
04/14/2009
04/07/2009
03/31/2009
03/17/2009
03/10/2009
03/03/2009
02/24/2009
02/17/2009
02/10/2009
02/03/2009
01/27/2009
01/20/2009
01/13/2009
01/06/2009
12/02/2008
11/25/2008
11/18/2008
11/11/2008
11/04/2008
10/28/2008
10/21/2008
10/14/2008
10/07/2008
09/30/2008
09/23/2008
09/09/2008
08/26/2008
08/19/2008
08/12/2008
08/05/2008
07/29/2008
07/22/2008
07/15/2008
07/08/2008
07/01/2008
06/24/2008
06/10/2008
06/03/2008
05/27/2008
05/20/2008
05/13/2008
05/06/2008
04/29/2008
04/22/2008
04/15/2008
04/08/2008
04/01/2008
03/18/2008
03/11/2008
03/04/2008
02/26/2008
02/19/2008
02/12/2008
02/05/2008
01/29/2008
01/22/2008
01/15/2008
01/08/2008
12/04/2007
11/27/2007
11/20/2007
11/13/2007
11/06/2007
10/30/2007
10/16/2007

September 29–October 5, 2010

Problem

From the set of natural numbers {1,2,3,...,2n}, choose any subset Y containing exactly n+1 numbers.
Are there two elements in Y such that one is a multiple of the other?

Solution

here

List of solvers

Jonathan Cross, Chaitanya Rachabattuni, Peiyush Jain, Crispin Pereira, Lloyd Sakazaki

Chaitanya Rachabattuni wins the prize!