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Number of Functions Possible from Set a to Set B

The number of...

Question

The number of injections that can be defined from a set A consisting 5 elements to a set B consisting 6 elements is

A

720

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B

360

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C

180

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D

90

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Solution

The correct option is A 720
The number of injections from A to B = $^{6} P_{5}$ = 6! = 720

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