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Subjects
Mathematics State Board
Class 9
Set Language
Application on cardinality of sets

1. Choose the correct answer

Exercise condition:

3 m.

1. If

$U = \{x : x \in \mathbb{W}$ and

$x < 10\}$ ,

$P = \{0, 2, 3, 4, 7\}$ and

$Q = \{1, 2, 5, 7, 8, 9\}$ , then

$n(P \cup Q)$

$=$ _______________.

$8$
$10$
$7$
$9$

2. If

$A$ and

$B$ are two finite sets, then

$n(A \cap B)$

$=$ ________________.

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

3. If

$A$ and

$B$ are disjoint sets, then

$n(A \cup B)$

$=$ _______________.

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

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