2. If (G, .) is a group such that (ab)- 1 = a-1b-1, ∀ a, b ∈ G, then G is a/an

- Option : B
- Explanation :

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4. The inverse of - i in the multiplicative group, {1, - 1, i , - i} is

- Option : C
- Explanation :

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- Option : C
- Explanation :

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