A:={a,e,i,o,u,y}.
(i)Find a fonctiong:A→Nsuch as Im(g)|= 4, where Im(g) is the image ofg.
(ii)f:A→Na fonction.Show that 1≤ |Im(f)| ≤6.
(iii)f:A→Na fonction.Show the preposition "|Im(f)|= 6only iffis injective".
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