Answer:
The answer is A = { 5 , 6 , 7 }
Explanation:
Since all the members in A = { 5 , 6 , 7 } are all in the universal set
R= {2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12}
Which makes A = { 5 , 6 , 7 } a subset.
Hope this helps
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