20) For a, b E NO we define a ob if and only if a and...

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20) For a, b E NO we define a ob if and only if a and b have the same remainder after ivision by 3. Using only this definitio

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(a) let a=s & b=8 . Botth have reminder a when divisible by 3. so aab or 508 82=64 = 213 +1 Remidor is I when r2 is divisible

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