Q. 21 B5.0( 1 Vote )

Given A = {2, 3, 4}, B = {2, 5, 6, 7}. Construct an example of each of the following:

a mapping from A to B which is not injective

Answer :

TIP: One – One Function: – A function is said to be a one – one functions or an injection if different elements of A have different images in B.


So, is One – One function


a≠b


f(a)≠f(b) for all


f(a) = f(b)


a = b for all


Now, f : A B, denotes a mapping such that


f = {(2,2),(3,5),(4,5)}


Hence this is not injective mapping


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