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  4. The set A has 4 elements and the set B has 5 elements then the number of injective mapping that can be defined from A to B is

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Q. The set A has 4 elements and the set B has 5 elements then the number of injective mapping that can be defined from $A$ to $B$ is

Solution:

Injective functions $=\,{}^{5} p_{4}$