Question: Give a combinatorial argument to verify that for all n Z+, (For each 1 k n, dk = the number of derangements

Give a combinatorial argument to verify that for all n ˆˆ Z+,
Give a combinatorial argument to verify that for all n

(For each 1 ‰¤ k ‰¤ n, dk = the number of derangements of 1, 2, 3, . . . , k; d0 = 1.)

In k-

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