if a, b are positive integers, define a * b = a where ab = a (modulo 7), with

Question

if a, b are positive integers, define a * b = a where ab = a (modulo 7), with this * operation, then inverse of 3 in group g (1, 2, 3, 4, 5, 6) is

Options:

A . 1

B . 3

C . 5

D . 7

Answer: Option C
Explanation :

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