Let \( \xi \) be set of all triangles in a plane. If \( \mathrm{A} ...

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Let \( \xi \) be set of all triangles in a plane. If \( \mathrm{A} \) is the set of all triangles in that plane with atleast one angle different from \( 60^{\circ} \), what is \( \mathrm{A}^{\prime} \) ?
\( \mathrm{P} \)
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