In how many ways can the integers 1 through 9 be permuted


Question: (a) In how many ways can the integers 1 through 9 be permuted such that no odd integer will be in its natural position?

(b) In how many ways can the integers I through 9 be permuted such that no even integer is in its natural position?

(c) In how many ways can the integers I through 9 be permuted such that exactly four of the nine integers are in their natural positions?

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Mathematics: In how many ways can the integers 1 through 9 be permuted
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