Question

If n(A) = n(B), then
which
of
the
following is correct?
1) n(A-B) = n(B-A
2) n(AUB) = n(A) + n(B)
3) n(An B) = n(B) + n(A-B)
4) n(A-B) = n(ANB)​

Answer 1

Answer:

n(A) = n(B), then

which

of

the

following is correct?

1) n(A-B) = n(B-A)