Let U be the set of all triangles in a plane. If A is the set of all triangles with at least one angle different from 60o, what is A'?
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Solution
U- Set of all triangles in a plane A- Set of triangles with at least one angle different from 600 i.e. the set cannot have equilateral triangles A′=U−A So, A′ is the set of all equilateral triangles.