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CBSE
Mathematics
Relations
Which type of relation ${x^2} = xy$ is:
(A) Symmetric
(B) Reflexive and transitive
(C) Transitive
(D) None of the above

CBSE
Mathematics
Relations
Let R = {(a, a), (b, b), (c, c), (a, b)} be a relation on set A = {a, b, c}. Then, R is
(a)identity relation
(b)reflexive
(c)symmetric
(d)equivalence

CBSE
Mathematics
Relations
If R is a symmetric relation on a set A, then write a relation between R and ${{R}^{-1}}$.

CBSE
Mathematics
Relations
Let ‘R’ be the relation defined on the set A = {1, 2, 3, 4, 5, 6, 7} by R = {(a,): both ‘a’ and ‘b’ are either odd or even}. Show that ‘R’ is an equivalence relation. Further, show that all the elements of the subset {1, 3, 5, 7} are related to each other and all the elements of the subset {2, 4, 6} are related to each other but no element of the subset {1, 3, 5, 6} is related to any element of the subset {2, 4, 6}.

CBSE
Mathematics
Relations
A relation R is defined from a set $A = \left\{ {2,3,4,5} \right\}$ to a set $B = \left\{ {3,6,7,10} \right\}$ as follows: $\left( {x,y} \right) \in R \Leftrightarrow x$ is relatively prime to $y$ . Express R as a set of ordered pairs and determine its domain and range.

CBSE
Mathematics
Relations
Write the coefficient of ${x}^{2}$ in each of the following:-
a)$17\text{ }-\text{ }2x\text{ }+\text{ }7{{x}^{2}}$
b)$9\text{ }-\text{ }12x\text{ }+\text{ }{{x}^{3}}$
c)$\dfrac{\pi }{6}~{{x}^{2}}-\text{ }3x\text{ }+\text{ }4$
d)$\sqrt{3}x-\text{ }\text{ }7$

CBSE
Mathematics
Relations
Let we have the sets as $A = \left\{ {1,2,3} \right\},B = \left\{ {1,3,5} \right\}$. If relation R from A to B is given by $R = \left\{ {\left( {1,3} \right),\left( {2,5} \right),\left( {3,3} \right)} \right\}$. Then ${R^{ - 1}}$ is
1. $\left\{ {\left( {3,3} \right),\left( {3,1} \right),\left( {5,2} \right)} \right\}$
2. $\left\{ {\left( {1,3} \right),\left( {2,5} \right),\left( {3,3} \right)} \right\}$
3. $\left\{ {\left( {1,3} \right),\left( {5,2} \right)} \right\}$
4. None of these

CBSE
Mathematics
Relations
If a relation R on the set $\left\{ {1,2,3} \right\}$ be defined by $R = \left\{ {\left( {1,2} \right)} \right\}$ , the R is
$\left( 1 \right)$ reflexive
$\left( 2 \right)$ transitive
$\left( 3 \right)$ symmetric
$\left( 4 \right)$ none of these

CBSE
Mathematics
Relations
Consider the following relations:
$R =${$(x,y)|x,y$ are real numbers and $x = wy$ for some rational number $w$}
$S =${$\left( {\dfrac{m}{n},\dfrac{p}{q}} \right):m,n,p,q$ are integers such that $n,q \ne 0,qm = pn$}, then:
A. neither $R$ nor $S$ is an equivalence relation.
B. $S$ is an equivalence relation but $R$ is not an equivalence relation.
C. $R$ and $S$ both are the equivalence relations.
D. $R$ is an equivalence relation but$S$is not an equivalence relation.

CBSE
Mathematics
Relations
If $R = \{ (x,y):x,y \in Z,{x^2} + {y^2} \leqslant 4\}$ is a relation defined on Z, Write domain of R.

CBSE
Mathematics
Relations
Let R = {(1, 3), (2, 2), (3, 2)} and S = {(2, 1), (3, 2), (2, 3)} be two relations on set A = {1, 2, 3}. Then $SoR$ =?
(a) {(1, 3), (2, 2), (3, 2), (2, 1), (2, 3)}
(b) {(3, 2), (1, 3)}
(c) {(2, 3), (3, 2), (2, 2)}
(d) {(3, 2), (2, 1), (2, 3)}

CBSE
Mathematics
Relations
If A = {1, 2, 3} and B = {1, 4, 6, 9} and R is a relation from A to B defined by ‘x’ is greater than ‘y’. The range of R is
1). {1, 4, 6, 9}
2). {4, 6, 9}
3). {1}
4). None of these

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