1 votes 1 votes Determine whether each of these functions form $[a,b,c,d]$ to itself is onto? $f(a)=b, f(b)=a,f(c)=c,f(d)=d$ $f(a)=b, f(b)=b,f(c)=d,f(d)=c$ $f(a)=d, f(b)=b,f(c)=c,f(d)=d$ Mathematical Logic kenneth-rosen discrete-mathematics set-theory&algebra + – Pooja Khatri asked Apr 9, 2019 Pooja Khatri 204 views answer comment Share Follow See all 0 reply Please log in or register to add a comment.