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.
-$n ( A \cup B ) = n ( A ) - n ( B )$

Name: 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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Question

Quizplus · Accepted Answer

The correct formula for the cardinality of the union of two sets is $n(A \cup B) = n(A) + n(B) - n(A \cap B)$, not $n(A) - n(B)$.

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

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