Question: (a) Construct a table (as in Example 14.21) for the isomorphism f: Z20 Z4 Z5. (b) Use the table from part (a) to compute

(a) Construct a table (as in Example 14.21) for the isomorphism f: Z20 Z4 × Z5.
(b) Use the table from part (a) to compute the following in Z20-
(i) (17)(19) + (12)(14)
(ii) (18)(11) - (9)(15)

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