Me and my doggie!!
posted by Kent at
6:38 PM
About
e-learning: The fun begins!
About Me
- Name: Kent
- Location: Singapore
I am a really shy guy who hate crowds but love being with friends! I also enjoy a good laugh!!
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Puzzle of the day from perplexus.info: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? |
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