Basic set operation.

Question

x = {1,2,3} y ={2,3,4}. How could you get { 4} from x and y using basic set operation

Answer 1

print( y - x & y )
x & y will give common elements among them so
{2 , 3}
now y -{2, 3}
will remove the element {2, 3} from y
so
{4} is all that is left
Edit: print( y - x ) will also work as answered by HonFu

Answer 2

HonFu Oh! Totally forgot about that.

Answer 3

y-x