If \( X \) is the set of negative numbers and \( Y \) is the set of positive numbers, then the union of \( X \), \( Y \), and 0 is the set of:
A. all real numbers
B. all integers
C. all rational numbers
D. all irrational numbers
E. all odd integers
Answer (2)
A............................
The union of the set of negative numbers, the set of positive numbers, and zero includes all real numbers. Therefore, the answer is A. all real numbers.
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