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What is the unique three-digit positive integer x satisfying 100x = 1 (mod 991).

 Dec 11, 2020
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a=100; c=100*a % 991; if(c==1, goto3, goto4);printc, a; a++;if(a<1000, goto1, 0)

 

x = 882

 

[100*882] mod 991 ==1

 Dec 11, 2020

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