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permutation and combination

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What are some similarities and differences between permutations and combinations? Give a real-life example of either a permutation or combination.

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This posting encompasses permutation and combination.

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A permutation is a way to organize a set of objects where the position of the object in the list has importance.
For example, the number of permutations of the list (shoe,socks) is 2:
it can be {socks, shoe} or {shoe,socks}.
The two lists are not equivalent!

In combination we order the set without no importance to the order. In this case the way to organize the list {socks, shoe} since {shoe,socks} is ...

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