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

Question From - NCERT Maths Class 12 Chapter 1 SOLVED EXAMPLES Question - 14 RELATIONS AND FUNCTIONS CBSE, RBSE, UP, MP, BIHAR BOARD
QUESTION TEXT:-
Show that a one-one function `f : {1, 2, 3}- gt {1, 2, 3}` must be onto.
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