Question

what is the inverse of 3 mod 5?

Answer 1

We want to find the value of x that satisfies 3x = 1 (mod 5)


3*1 = 3 (mod 5)

3*2 = 6 = 1 (mod 5)


So x = 2 (mod 5)

Which means that the inverse of 3 mod 5 is 2.