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Union of Sets

If nA=18, ...

Question

If $n (A) = 18$ , $n (B) = 12$ , and $A \cap B = \emptyset$ , then $n (A \cup B) =$

A

6

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B

12

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C

30

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D

20

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Solution

The correct option is C $30$
$n (A \cup B) = n (A) + n (B) - n (A \cap B) = 18 + 12 - 0 = 30$

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