Some of my students on the last day of school.
a photographic exploration of my home in Belize. Contact me at cjphotobelize at gmail dot com.
Second year teacher at Mount Carmel High School in Belize.
![]() 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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