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Solution


Q.

If the set A contains 5 elements and the set B contains 6 elements, then the number of one-one and onto mappings from A to B is:
1 720  
2 120  
3 0  
4 None of these  

Ans.

(3)

Ans.    0

Explanation:

Total number of elements in set A=5

Total number of elements in set B=6

As, the number of bijections from A to B is possible only when n(A)≥n(B)

But here, n(A)<n(B)

Hence, the total number of bijections from A to B is 0.