11. Consider the group D, For the subgroup H = {(1), (12)(34)}, write all cosets that can be formed. (Note that subgroup H is of size 2, and can be written as H= {Ro, V}. You can use either cycle notation or alphabetic notation in building your cosets.)

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Q: why are cosets not always subgroups? can you please give an example. thank you.

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