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The set A has 4 elements and the set B had 5 elements then the number of objective mapping that can be defined from A to B is ? Answers is: 120 How to do this question?

Answer» The set A has 4 elements and the set B had 5 elements then the number of objective mapping that can be defined from A to B is ?
Answers is: 120
How to do this question?


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