Q. 354.0( 3 Votes )

If the set A cont A. 720

B. 120

C. 0

D. none of these

Answer :

Number of elements in A = 5


Number of elements in B = 6


Now, for a function to be one-one all elements of domain should have unique image in co-domain.


Here, 5 elements of A can be mapped to 5 distinct element of B.


function is one-one


But range of B is 6 that means there is one element in B which does not have pre-image in A.


Thus the function cannot be onto if it is one-one.


Also, if all 6 elements of B are mapped to all 5 elements of A, then we can observe there will be atleast 2 elements of B which have same pre-image in A.


one element of A will have two image in B.


function is not one-one


Thus the function cannot be one-one if it is onto.


Hence, there cannot be any one-one and onto mapping from A to B.

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