If n(A) = 12, n(B) = 17 and (\n(A \cup B) = 21 \), then n(A∩B) is equal to ___.

If n(A) = 12, n(B) = 17 and (\n(A \cup B) = 21 \), then n(A∩B) is eq

1.	If n(A) = 12, n(B) = 17 and (\n(A \cup B) = 21 \), then n(A∩B) is equal to ___.
Answer» If n(A) = 12, n(B) = 17 and (\n(A \cup B) = 21 \), then $n (A \cap B)$ is equal to ___.