Question

Question

Let X = {2,4,5,6} Y = {3,4,7,8), find (X - Y) n (Y -X)

A. {2,5,6}
B. {3,7,8}
C. {2,3,5,6,7,8}
D. empty set

Answer 1

D. empty set

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} = { }