The number of one one functions that can be defined from ${a, b, c, d}$ to ${1, 2, 3, 4}$ to is

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Solution

The correct option is A 24
$\begin{matrix} A = {a, b, c, d} B = {1, 2, 3, 4} \end{matrix}$
So, number of one-one function $= 4!$
Hence, Option $B$ is correct answer.

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$1)$ The number of relations from $A = {1, 3, 5}$ to $B = {a, b, c}$ is	$a)$ 15
$2)$ The number of constant functions that can be defined from $R$ to $A = {0, 2, 4, 6, 8, . ., 28}$	$b)$ 6
$3)$ The number of one-one functions from $A$ to $A$ is $720$ , then $n (A)$	$c)$ 512
$4)$ The number of identity functions on the set $A = {1, 2, 3, 4, 5, 6}$	$d)$ 1
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1, 2, 3, 4

A = {a, b, c, d}

B = {1, 2, 3}

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