1.

State in each case whether A ⊂ B or A ⊄ B. A = {x : x is an isosceles triangle in the plane}, B = {x : x is an equilateral triangle in the same plane}

Answer»

A ⊄ B 

Explanation: since all isosceles triangles are not equilateral triangles. Therefore set of isosceles triangle is not contained in the set of equilateral triangle.



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