Friday, 2 November 2018

equivalence relations - fine the inverse of [2] and [23] inmathbbZ41

I know the inverse of [23] is




[23] * [25] = 575



575 congruent to 1 mod 41



[25] is the inverse



I have started the other one but I am doing something wrong I got



[2] * [41] = [82] = [0]




82 congruent to 0 mod 41



I thought 41 would be the inverse but it is not.

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