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

If a, b are positive integers, define a * b = a where ab = a (modul

1.	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
A.	1
B.	3
C.	5
D.	7
Answer» D. 7