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 4P3 = 4! = 24.