Join X moo X al/material/d699fc74cb7626c0227ef68649e2b7a4/609a1aa6/MAT2612/tl/001 2021 3_b.pdf AnswX 12 / 16 100% 7. Decide for each of the following relations whether or not it is an equivalence relation. Give full reasons. If it is an equivalence relation, give the equivalence classes. a (a) Let a, b E Z. Define a Rb if and only if EZ (4) (b) Let a and b be integers. Define a Rb if and only if 3 (a-b) (In other words R is the see KBR 4.5) congruence modulo 3 relation (8)

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