Kenneth Rosen Edition 7 Exercise 2.3 Question 11 (Page No. 153)

Question

Determine whether each of these functions form $[a,b,c,d]$ to itself is onto?

1. $f(a)=b, f(b)=a,f(c)=c,f(d)=d$
2. $f(a)=b, f(b)=b,f(c)=d,f(d)=c$
3. $f(a)=d, f(b)=b,f(c)=c,f(d)=d$