Question

Question

Answer 1

Answer:

  D.  empty set

Step-by-step explanation:

Each of the operations X-Y and Y-X removes elements that are common to X and Y. The resulting two sets have no elements in common, so their intersection is the empty set.

_____

  X -Y = {2, 5, 6}

  Y -X = {3, 7, 8}

  {2, 5, 6} ∩ {3, 7, 8} = { }