Question: Consider the equation 2x + 1 = 0 mod n. For which n are there no solutions? one solution? multiple solutions? For n = 10
Consider the equation 2x + 1 = 0 mod n. For which n are there no solutions? one solution? multiple solutions?
For n = 10 and n = 12 determine which elements mod n have reciprocals. Do you see any pattern? Can you prove it holds for other n?
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