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Ordered pair, Cartesian product of two sets - Practice Questions & MCQ

Edited By admin | Updated on Sep 18, 2023 18:34 AM | #JEE Main

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  • 48 Questions around this concept.

Solve by difficulty

A pair of elements grouped together in a particular order is called:

$A=\{1,3\}$ and $B=\{a, b, c\}$, then $A X B=$ ?

If $(x-3,2 x)=(y,-x+y)$, Then find $(x, y)$

If $A \subseteq B$, then $A \times A \subseteq(A \times A)-\_(B \times A)$. Fill in the blank.

If $A=\{1,2\}$ and $B=\{0,1,2,3\}, C=\{a, b\}$, then $(A \times C) \subseteq$

The cartesian product is:

Fill in the blank: $(A * B) \cap(C * D)$ ___________ $(A \cap C) *(B \cap D)$

 

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$A *(B-D)=$

$A *(B \cap C)=$

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$A *(B \cup C)=$

Concepts Covered - 2

Ordered pair, Cartesian product of two sets

Ordered pair

A pair of elements grouped together in a particular order is known as an ordered pair.
e.g. : $(a, b),(3,5),(1,0) \ldots$

The ordered pairs ( $\mathrm{a}, \mathrm{b}$ ) and ( $\mathrm{b}, \mathrm{a})$ are different.
Two ordered pairs are equal, if and only if the corresponding first elements are equal and the second elements are also equal.
i.e. $(x, y)=(u, v)$ if and only if $x=u, y=v$.

Cartesian product
The cartesian product of two nonempty sets $A$ and $B$ is the set of all ordered pairs $(x, y)$, where $x \in A$ and $y \in B$.
Symbolically, we write it as $\mathrm{A} \times \mathrm{B}$ and it is read as ' A cross B '.

$
A \times B=\{(a, b): a \in A, b \in B\}
$
For example, If $A=\{1,2\}$ and $B=\{a, b\}$
Then $A \times B=\{(1, a),(1, b),(2, a),(2, b)\}$
Note
m$A \times A \times A=\{(a, b, c): a, b, c \in A\}$. Here $(a, b, c)$ is called an ordered triplet.
$R \times R=\{(x, y): x, y \in R\}$ and $R \times R \times R=(x, y, z): x, y, z \in R\}$

Number of elements in A x B

If there are $p$ elements in $A$ and $q$ elements in $B$, then there will be $p q$ elements in $A \times B$, i.e., if $n(A)=p$ and $n(B)=q$, then $n(A \times B)=p q$.

Important theorem on Cartesian product

If $A, B, C$ and $D$ are any four sets, then

$
\begin{aligned}
& A X(B \cup C)=(A \times B) \cup(A \times C) \\
& A X(B \cap C)=(A \times B) \cap(A \times C) \\
& A X(B-C)=(A \times B)-(A \times C)
\end{aligned}
$
$
\begin{aligned}
& (A \times B) \cap(C \times D)=(A \cap C) \times(B \times D) \\
& \text { If } A \subseteq B \text {, then }(A \times C) \subseteq(B \times C)
\end{aligned}
$
If $A \subseteq B$, then $A X A \subseteq(A X B) \cap(B \times A)$ If $A \subseteq B$ and $C \subseteq D$, then $A X C \subseteq B \times D$

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Ordered pair, Cartesian product of two sets
Important theorem on Cartesian product

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