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a. Prove for all σ, τ ∈ Sn that στσ−1 τ −1 ∈ An. b. Let...

a. Prove for all σ, τ ∈ Sn that στσ−1 τ −1 ∈ An.

b. Let p and q be distinct odd primes. Prove that Zxpq is not a cyclic group.

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