6. For 0 < a, b < p, prove that at least one of a, b, and ab is a quadratic residue of p.
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6. For 0 < a, b < p, prove that at least one of a, b, and ab is a quadratic residue of p.
6. For 0 < a, b < p, prove that at least one of a, b, and ab is a quadratic residue of p.
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