Question

If A = { x: where x belongs to natural numbers, x<6 }
and B = {x : where x belongs to natural numbers, 3 < x < 8}
then show that A - B is not equal to B - A.

Answer 1

A={x:x belongs to natural numbers, x<6}
A={1,2,3,4,5}
and
B={x:x belongs to natural numbers, 3 < x < 8}
B={4,5,6,7}
so,
A-B = {1,2,3}
B-A = {6,7}
here,
A-B ≠ B-A
hence proved

Answer 2

Hope it will help you.