Question

please answer this
I will mark as brainliest

Answer 1

Note: 'U' means union. '&' means intersection in my answer.


1) n(A U B) = n(A) + n(B) - n(A & B)

2) If A and B are disjoint sets, it means that A&B = null set
Thus n(A & B) = 0
So, from above formula,

n(A U B) = n(A) + n(B)