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10. (14 points) Determine whether each of the following functions are (i) one-to-one and (ii) 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

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