Teaching DSSSB TGT Mock Test 2025 Engineering Mathematics Set Theory & Algebra Groups

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

1
Commutative semi group
2
Abelian group
3
Non-abelian group
4
None of these
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