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[" If "26." If "A" and "B" are two indep...

[" If "26." If "A" and "B" are two independent everits,"],[" [ail "27." Show that "f:N rarr N," given by "f(x)={[x+1," if "x" is odd "],[x-1," if "x" is even "]" is both one-one and onto."]

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