Solution:
Union is obtained by listing each of the items (numbers) in the sets in ascending order without repeating any of the items (numbers)
Q={1,3,5,7,9,10,11,13,15} and T={1,2,3,5,6,7,10,11,12}
Q∪T={1,2,3,5,6,7,9,10,11,12,13,15}
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