Question: As part of a cryptography assignment in CMSC 350, a student has written code to generate random permutations P on a set of n characters.

  1. As part of a cryptography assignment in CMSC 350, a student has written code to generate random permutations P on a set of n characters. If the permutation leaves too many inputs unchanged, it might result in a weakness in the system. Assuming the permutations are truly random, how many characters do I expect to be left unchanged by the permutation?

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