Let $A=\{p, q, r, s\}$ and $B=\{1,2,3\}$. Which of the following relations from $A$ to $B$ is not a function?

$R_1=\{(p, 1),(q, 2),(r, 1),(s, 2)\}$

$R_2=\{(p, 1),(q, 2),(r, 1),(s, 1)\}$

$R_4=\{(p, 2),(q, 3),(r, 2),(s, 2)\}$

JEE MATHEMATICS MCQ: RELATIONS

1 Easy

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Understanding +4 | -1

Let

A=\{p, q, r, s\}

and

B=\{1,2,3\}

. Which of the following relations from

A

B

is not a function?

View answer and explanation

Correct option: C

R_3=\{(p, 1),(q, 2),(r, 2),(r, 2)\}

Option C (

R_3=\{(p, 1),(q, 2),(r, 2),(r, 2)\}

) is not a function because the element 'r' in A is mapped to two different elements in B.

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