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Question
If A and B are two finite sets, then n(A) + n(B) is equal to ______.
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Solution
If A and B are two finite sets, then n(A) + n(B) is equal to n(A ∪ B) + n(A ∩ B).
Explanation:
Since n(A ∪ B) = n(A) + n(B) – n(A ∩ B)
So n(A) + n (B) = n(A ∪ B) + n(A ∩ B)
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