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September 9–September 22, 2008

Problem

Reconstruct the multiplication: (Letters A, B, C, D, E, and F stand for particular digits, asterisks may be any digit.)

             A B C D E F  
           * * * * * * *  
          --------------- 
             A B C D E F  
           F A B C D E    
         E F A B C D      
       D E F A B C        
     C D E F A B          
   B C D E F A            
 A B C D E F              
------------------------- 
 A * * B * C D * * E * F

Solution

List of solvers

Trey Sakazaki (elementary); Qiaochu Yuan (undergrad); Dustin Moody (graduate); Gary Raymond (staff); Lawrence Hon, Mike Goodman, Steve Wilmarth, Greg Rudzinski, Lloyd Sakazaki (outside)

Gary Raymond wins the prize!