Question
Determine whether each of these functions from $\{a, b, c, d\}$ to itself is one-to-one.a) $f(a)=b, f(b)=a, f(c)=c, f(d)=d$b) $f(a)=b, f(b)=b, f(c)=d, f(d)=c$c) $f(a)=d, f(b)=b, f(c)=c, f(d)=d$
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In other words, if f(x1) = f(x2) then x1 must be equal to x2. Show more…
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