If A B^1 then n(A B)=? - Vidyadip

MCQ

If ${\text{A}\cup\text{ B}^1}$then $\text{n}(\text{A }\cup\text{ B})=?$

✓
$\text{n(A)} + \text{n(B)} - \text{n}(\text{A}\cap\text{B})$
B
$\text{n(A)} - \text{n(B)} + \text{n}(\text{A}\cap\text{B})$
C
$\text{n(A)} - \text{n(B)} - \text{n}(\text{A}\cap\text{B})$
D
$\text{n(A)} + \text{n(B)} + \text{n}(\text{A}\cap\text{B})$

✓

Answer

Correct option: A.

$\text{n(A)} + \text{n(B)} - \text{n}(\text{A}\cap\text{B})$

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