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Let = {0, 1, 2, ..., 41}. Consider the binary operation @ : Z42 X Z42 -> Z42 given by a @ b = (a

Let = {0, 1, 2, ..., 41}. Consider the binary operation @ : Z42 X Z42 -> Z42 given by a @ b = (a + b) mod 42. The identity with respect to @ in Z42 is The inverse of 28 with respect to @ in Z42 is

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