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# Select the empty sets among the following sets.  i) A = {x/x is a root of x + 3 = 3} ii) C = {x/x is an even as well as an odd number}  iii) D = {x/x is a natural number less than 1} iv) The set all triangles with two obtuse angles.  v) The set of points in a plane.

ii), iii), iv) are the empty sets.