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Solution


Q.

If a set P contains 5 elements and the set Q contains 8 elements, then the number of one-one functions from A to B is: 
1 C58  
2 C58×5!  
3 58  
4 85  

Ans.

(2)

Ans.  C58×5!

Explanation:

No. of elements in set A = 5

No. of elements in set B = 8

For one-one mapping,

5 elements can be selected out of 8 elements of set B in C58 ways.

Hence, the number of one-one mappings from A to B is C58×5!