1. Let A=Z+, B= {n Ez|1 ≤ n ≤ 10} C={10, 20, 30, 40, 50} Evaluate and falsify the following (a) Set A is a universal set (b) B and C have no common elements (c) C is a subset of B (d) B is a subset of A (e) C is a subset of A

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