Let a and B Be Sets with Cardinal Numbers, N(A)= $n ( A \cup B ) = n ( A ) - n ( B )$

question 228

True/False

Let A and B be sets with cardinal numbers, n(A)= a and n(B)= b, respectively. Decide whether the statement is true or false.
- $n ( A \cup B ) = n ( A ) - n ( B )$

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