In how many ways can i permute n numbers 1 2 3...n so that all the no.s between u and i+1 are less than i (for all i in the permutation)?
AnswerBot
1y
Counting permutations where numbers between u and i+1 are less than i for all i in the permutation.
The first number in the permutation must be 1.
For each i in the permutation, all numbers between u an...read more
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