Question: 6. (a) Prove or disprove: If a E 5 {mod 5), where a and b are integers, then a2 E .52 (mod 5). (b) Prove

6. (a) Prove or disprove: If a E 5 {mod 5), where a and b are integers, then a2 E .52 (mod 5). (b) Prove or disprove: If a2 E b2 (mod 5}, where a and b are integers, then a. E b (mod 5)

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