Use Euler's phi function to save yourself the trouble of counting.

...or count to save yourself the trouble of using Euler's phi function... just kidding :-P

im still confused on this one, can you explain a little more about how you found your answer

i got 32 can any one verify?

If GF(81)* has 80 elements, $ \phi(80)=32 $.


I got 32 too.

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