(Z,*) is a group with a*b = a b 1 ∀ a, b ∈Z. The inverse of a is

1.	(Z,) is a group with ab = a b 1 ∀ a, b ∈Z. The inverse of a is
A.	-2
B.	0
C.	-a-2
D.	a-2
Answer» D. a-2

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