If A and B are not disjoint sets, then n(A B) is equal to - Vidyadip

MCQ

If $A$ and $B$ are not disjoint sets, then $n(A \cup B)$ is equal to

A
$n(A) + n(B)$
✓
$n(A) + n(B) - n(A \cap B)$
C
$n(A) + n(B) + n(A \cap B)$
D
$n(A)\,n(B)$

✓

Answer

Correct option: B.

$n(A) + n(B) - n(A \cap B)$

b
(b) $n(A \cup B) = n(A) + n\,(B) - n(A \cap B)$.

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