(a) R₁ = {(x,y): x, y Є Z, 2 | (x² + y²)}. (b) R₂ = {(x, y): x,yЄZ,4 | (x+3y)}. (c) R3 = {(x, y): x, y Є Z, r² = y²(mod 4)}. B msi M

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Q: 6. (a, b), C

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