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

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

(1) 72 

(2) 120 

(3) 144 

(4) 60

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1 Answer

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Best answer

Correct option (2) 120

Explanation:

Number of injective mappings = nPm = 5P4 = 120.

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