Consider the equation 2x + 1 = 0 mod n. For which n are there no solutions? one solution? multiple solutions?

Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
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1.) Consider the equation 2x + 1 = 0 mod n. For which n are there no solutions? one solution? multiple solutions? 2.) For n = 10 and n = 12 determine which elements mod n have reciprocals. Are there any patterns? Can you prove it holds for other n?
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