Question

Show that a one-one function f : {1, 2, 3} → {1, 2, 3} must be onto.​

Answer 1

$\huge\underline\frak{\fbox{AnSwEr :-}}$

Solution Since f is one-one, three elements of {1, 2, 3} must be taken to 3 differentelements of the co-domain {1, 2, 3} under f. Hence, f has to be onto.

Answer 2

Answer:

Functions are very important in the sets