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Byju's Answer
Standard VII
Mathematics
Number of Functions Possible from Set a to Set B
If | A |=| B ...
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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