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Feliz [49]
3 years ago
12

A multiplicative inverse of 3 modulo 5 is any integer a such that 3 a ≡ 1 (mod 5) , hence for some a ∈ Z5 .

Computers and Technology
1 answer:
cricket20 [7]3 years ago
4 0
The obvious element for which it can't exist is 0 as a*0=0 independent of modulo
all other elements have an inverse:
1*1≡1
2*3≡6≡1
3*2≡6≡1
4*4≡16≡1

if there are more than a few numbers/guessing is inefficient it can be calculated using the extended euclidean algorithm
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