1. (a) Compute gcd(132,84). (b) Suppose a,b ∈N are co-prime. What is gcd(a,a + b)? 2. For sets A and B, deﬁne A∗B to be (A∪B)c (the complement of A∪B). (a) Simplify (A∗B)∗(A∗B). Justify your answer (e.g. using a Venn diagram or some other technique). (b) Express Ac using A and ∗. Justify your answer. […]
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