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Number of Functions Possible from Set A to Set B

If |A|=|B|= 4...

Question

If |A|=|B|= 4, then the number of injections from A to B is

A

12

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B

16

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C

20

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D

24

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Solution

The correct option is D 24
The number of injections from A to B is 4! = 24

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