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1) Given defined K is onto since every element of co-domain is in range of K. But defined K is not a function because one element has 2 images.
2) 1→a,2→b,3→c,4→c . This is function and not one-one since 3 and 4 has same image. This is onto also.
3) Function is not defined where function is one-one because co-domain has less element than domain. Hence, atleast two element have one image which can-not be one-one.