













It Gets My Goat - So It's Going To Grantham.
**********************************************************WHY GRANTHAM? JUST CLICK: TEXT **********************************************************
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![]() Alternating Differences (Difficulty: 3 of 5) ![]() Let X1, X2, X3, ..., Xn be a permutation of the integers 1,2,3,...,n. Consider the sum:
What is the mean value of this sum taken over all possible permutations? |
2 comments:
Oooh, I've thought of a couple.
this - http://i6.photobucket.com/albums/y225/alexxshannon/jodiemarsh.jpg
and this - http://www.sparklingcleancarpets.com/Leather_Sofa.jpg
or what about -
http://images.scotsman.com/2006/01/28/en2801borb.jpg
and -
http://www.great-glass.co.uk/glass%20notes/clean/mop.jpg
Excellent, Betty.
I would never have thought of a use for Ms Marsh, other than kindling. I wouldn't sit on her, though - you might catch something.
Dear Boris. Yes, yes and yes. His hair isn't so much styled as........well.......there!
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