MATH312 December 2005
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The number of primitive roots of 98 is
- (a) 0
- (b) 12
- (c) 34
- (d) 42
- (e) None of the above.
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The number of primitive roots modulo n is equal to provided that for some odd prime p.
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The answer is d = 42
We use the multiplicativity of the phi function to see that
As the phi function computes the number of primitive roots modulo n, we are done.
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