1. Indicate the identity element of the given set and operator, or state that there is no identity. (a) N, a . b (d) {-2,
1. Indicate the identity element of the given set and operator, or state that there is no identity. (a) N, a . b (d) {-2, -1, 0, 1, 2}, a + b (b) Z, atb (e) {1, 2, 4, 5, 7, 8 }, a . b mod 9 (c) {0, 3, 6, 9}, a + b mod 12 ( f) Q, ( a + 6) /2
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