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If 31z5 is a multiple of 3,where , z is ...

If 31z5 is a multiple of 3,where , z is a digit,what might be the value of z.

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Let f : Z rarr Z be defined as f(n) = 3n for all n in Z . Let g : Z rarr Z be defined as g(n)= n/3 if n is a multiple of 3. g(n)= 0 if n is not a multiple of 3. Show that gof = I_z and fog ne I_Z