Question: Problem 1. Determine whether the given subset of C* is a subgroup of (C*, .) ( just answer yes or no, no reasons needed.)

Problem 1. Determine whether the given subset of C* is a subgroup

Problem 1. Determine whether the given subset of C* is a subgroup of (C*, .) ( just answer "yes" or "no", no reasons needed.) (1) The set of positive real numbers 2020 = 1}. (3) The set {z C* | z (4) The set {1,-1,2,}. (5) The set {3 | n Z}. (2). The set of positive integers

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