Hint: Use induction and argue thatPk{i1, i2, . . . , ij1,
Chapter 10, Problem 10.2(choose chapter or problem)
Hint: Use induction and argue thatPk{i1, i2, . . . , ij1, k, ij, . . . , ik2, i}= Pk1{i1, i2, . . . , ij1, i, ij, . . . , ik2} 1k= 1k!by the induction hypothesis
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