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One - One function

The set A has...

Question

The set $A$ has 4 elements and set $B$ has 5 elements then number of injective mappings that can be defines from $A$ to $B$ is

A

141

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B

72

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C

60

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D

120

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Solution

The correct option is D $120$
The number of injective mappings that can be defined from $A$ to $B$ is $5 \times 4 \times 3 \times 2 = 120$

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