1. Suppose A = {1,2, 3, 4} and the relation R on A is R = {(1,1), (2, 2), (3,3), (3, 4), (4, 4)} (a) Determine if R is an equivalence relation or not. Show your reasons. (b) Let the relation S be S = RU{(4, 3)}. Find the quotient set A/S.

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