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Comparison of Decimals

The Number of...

Question

The Number of one-one and onto functions that can be defined { $1, 2, 3, 4$ } onto set B is $24$ then $n (B)$ is

A

4

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B

2

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C

3

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D

6

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Solution

The correct option is B 4
n(B)=4 because A={1,2,3,4} has 4 element
and $f : A \to B$ are one-one-onto fraction
then B must have 4 element.

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