bajopalabra, on 15 February 2012 - 02:01 PM, said:
I'm sorry : it's page 256 !!!
Yeah, I just noticed that too. It's funny because I tried to be clever with my calculations (canceling out factorials, etc.) then I see the different result, and stared at my calculations for a while, trying to figure out where I was wrong, until I did the final division.