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Question
Make correct statement by filling in the symbols ⊂ or ⊄ in the blank space:
{x : x is a circle in the plane} _____ {x : x is a circle in the same plane with radius 1 unit}
Solution
{x : x is a circle in the plane} ⊄ {x : x is a circle in the same plane with radius 1 unit}
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