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Return to GATE2010 q4.
Consider the set S = $\{1, ω, ω^2\}$, where $\omega$ and $\omega^2$ are cube roots of unity. If * denotes the multiplication operation, the structure (S, *) forms
(A) A Group
(B) A Ring
(C) An integral domain
(D) A field
We can directly answer this question as "A Group", because other three options require two operations over structure, but let us see whether $(S, *)$ satisfies group properties or not.
Thus, $S$ satisfies all $4$ properties of group, so it is a group. In fact, $S$ is an abelian group, because it also satisfies commutative
property.
So, option (A) is correct.