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In each part below, a group G and a subgroup H are given. Determine whether H...

In each part below, a group G and a subgroup H are given. Determine whether H is normal in G. If it is, list the elements of the quotient group G/H. (a) G = Z-15 × Z-20 and H = <(10, 17)> (b) G = S-6 and H = A-6 (c) G = S-5 and H = A-4

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