1. Define on Z by a b if a|b. Is (A,) a poset? 2. Let A = {1, 2, 3} and f P(A) → Z, f(X) = n(X). Find the domain and the range of f. Is f 11 and/or onto?

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A: Steps and explanations are as follows:In case of any doubt, please let me know. Thank you.

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A: Step 1: Step 2: Step 3: Step 4: