Question

Given, A={2,3,4}, B ={2,5,6,7}. Construct an example of each of the following
(ii) a mapping from A to B which is not injective.

Answer 1

Given that, A={2,3,4}. B={2,5,6,7}
(ii)Let $g:A\to B$ denote a mapping such that g={(2,2),(3,5),(4,5)}, which is not an injective mapping.