Question

if B is a subset of A then B-A = ?​

Answer 1

Answer:

If set A is the subset of set B, it means that all the elements of set A are present in set B. Also A - B means elements of set A which are not present in set B. But as we know all the elements of set A are present in set B, so A-B = { } or in other words an empty set.

Answer 2

Answer:

B is a subset of A

A is bigger than B

B-A = A

example

A = (1,2,3,4,5,6,7,8,9,10 and so on )

B = (1,2,3)

then

B-A = ( 4,5,6,7,8,9,10 and so on)

B-A = A