There are 362,880 different numbers that use the digits 1 to 9 exactly once (like 187,432,569).

Of these, what percentage are prime numbers?

(In reply to German solution by Mindrod)

I guess you meant Kein

Where did you get the idea to come with a german solution?

Edited on December 29, 2005, 11:05 am

Posted by Hugo on 2005-12-29 03:32:38