please answer this
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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)
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)
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