If a = {x : 1 < x < 9} ; b = {x : 0 < x < 9} ; C = {x : 2 x < 9} and a, b, c U, what are the elements in U?
- U = {-1 < x < 9}
- U = {0 < x < 9}
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U = {1 < x < 9}
- U = {1 < x < 10}
- {2 < x < 10}