Question: Suppose that g is a primitive root modulo p, where p is an odd prime. Is it true that g(P-1)/2 =-1 (mod p)? Explain.

Suppose that g is a primitive root modulo p, where p is 

Suppose that g is a primitive root modulo p, where p is an odd prime. Is it true that g(P-1)/2 =-1 (mod p)? Explain.

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