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Find 4 to the -1st power, as a residue modulo 35. (Give an answer between 0 and 34, inclusive.)

 Apr 7, 2020
 #1
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4^(-1) = 15 mod 35.

 Apr 7, 2020
 #2
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Modular Multiplicative Inverse of 4 mod 35 = 9, because:

 

[9 x 4] mod 35 = 1 - which is the definition of MMI.

 Apr 7, 2020

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