Please help with #7 (7) Prove: The number of derangements of n objects is 1! 2! 3! n(Dn-1+ Dn) which simplifies to where the recursion is given by Dnt1 n+1 (7) Prove: The number of derangeme...

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Please help with #7

Answer 1

Answer #1

fall in比u ith place place、 thin, the CYby fixing ǐ) will derange ano nas annst UA n-2 u s Dn-y S terp Weger nt)

Answer 2

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