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mathwhiz22
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Homework Statement
Prove that if H is a subgroup of a finite group G, then the number of right cosets of H in G equals the number of left cosets of H in G
Homework Equations
Lagrange's theorem: for any finite group G, the order (number of elements) of every subgroup H of G divides the order of G.
The Attempt at a Solution
I know how to find subgroups of groups, and how to get the cosets from there. But i just don't understand how to show that right and left cosets will be equal because the group is finite..
Im stuck :( thanks for any help!