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Given:(1) Let R1 and R2 be two transitive relations on a set A. Then, R1 UNION R2 is a transitive relation on A.(2) Let R be the relation x + y = 0 on the set of all real numbers. Then, R is antisymmetric.Select one of the following choices:Question 10Answera.(1) is True and (2) is Falseb.(1) and (2) are Truec.(1) and (2) are Falsed.(1) is False and (2) is True

Question

Given:(1) Let R1 and R2 be two transitive relations on a set A. Then, R1 UNION R2 is a transitive relation on A.(2) Let R be the relation x + y = 0 on the set of all real numbers. Then, R is antisymmetric.Select one of the following choices:Question 10Answera.(1) is True and (2) is Falseb.(1) and (2) are Truec.(1) and (2) are Falsed.(1) is False and (2) is True

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Solution

The correct answer is d. (1) is False and (2) is True.

Explanation:

(1) Let R1 and R2 be two transitive relations on a set A. Then, R1 UNION R2 is a transitive relation on A. This statement is false. The union of two transitive relations is not necessarily transitive. For example, consider the set A = {1, 2, 3} with R1 = {(1, 2), (2, 3)} and R2 = {(3, 1)}. Both R1 and R2 are transitive, but R1 UNION R2 = {(1, 2), (2, 3), (3, 1)} is not transitive because (1, 3) is not in the relation.

(2) Let R be the relation x + y = 0 on the set of all real numbers. Then, R is antisymmetric. This statement is true. A relation R on a set A is antisymmetric if for all (a, b) in R where a ≠ b, (b, a) is not in R. In this case, if x + y = 0 and x ≠ y, then y + x = 0, but y ≠ x, so (y, x) is not in R. Therefore, R is antisymmetric.

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