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One - One function

The set A has...

Question

The set A has 3 elements and the set B has 4 elements. Then, the number of injective (one-one) mappings that can be defined from A to B is

A

144

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B

12

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C

24

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D

64

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Solution

The correct option is C 24
The total number of injective mappings from the set containing 3 elements into the set containing 4 elements is $4 P 3$ = 4! = 24.

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