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Determine whether each of these functions from {a,b,c,d} to itself is bijection if it is than find f -¹.

a) f(a)=b, f(b)=a, f(c)=d, f(d)=c
b) f(a)=a, f(b)=b, f(c)=c, f(d)=d​​

Sagot :

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