Let n ∈ Z. Prove n2 is congruent to x (mod 7) where x ∈ {0, 1, 2, 4}.

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answerhappygod
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Let n ∈ Z. Prove n2 is congruent to x (mod 7) where x ∈ {0, 1, 2, 4}.

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Let n ∈ Z. Prove n2 is congruent to x (mod 7) where x∈ {0, 1, 2, 4}.
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