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Questions related to permutations, bijections from a finite (or sometimes infinite) set to itself.

-1 votes
1 answer
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A permutation and combination problem about the number of connections in a sequence of n num... [closed]

There is a sequence of n numbers as 1,2,3,...,n How many combinations of the connections between two numbers in the sequence without overlaping? Take a sequence 1,2,3,4,5,6,7,8,9,10 for example: com …
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