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  • If the set A contains 5 elements and set B contains 6 elements, then the number of one-one and onto mapping from A to B is (a) 720 (b) 120 (c) 0 (d) None of these

If the set A contains 5 elements and set B contains 6 elements, then the number of one-one and onto mapping from A to B is

(a) 720 (b) 120 (c) 0 (d) None of these 

Answers (1)

Let, the number of elements in A and B set are m and n respectively. Therefore, one-one and onto mapping 

from A to B is n! when m = n 

and, 0 if m ≠ n 

It is given that, m = 5 and n = 6.

As,5 ≠ 6 So, from A to B mapping = 0

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infoexpert22

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