Let a*H and b*H be two cosets of H.
Then,
Ans: C
ref: http://www.emathzone.com/tutorials/group-theory/properties-of-cosets.html
https://math.stackexchange.com/questions/267143/prove-that-any-two-left-cosets-ah-bh-either-coincide-or-are-disjoint-and-pro
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