Let J4 ={ 0,1,2,3}. ThenJ4 {0}={ 1,2,3}. Student CS(x) is
Chapter 7, Problem 7.39(choose chapter or problem)
Let J4 ={ 0,1,2,3}. ThenJ4 {0}={ 1,2,3}. Student CS(x) is the number y so that (xy) mod 4=1. Student D claims that S is not well dened. Who is right: student C or student D? Justify your answer.
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