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Homework Statement
If H is a subgroup of a finite group G, and if the order of G is m times the order of H, |G|=m|H|, adapt the proof of Lagrange's theorem to show that gm! is an element of H for all g in G.
The Attempt at a Solution
My thoughts so far were to think that we can divide G into m pieces: H, g1H, g2H, ..., gm-1H. If we now take an arbitrary gk, it is certainly in gkH, since H contains the identity. The question now is: what happens if we look at gk2, (gk2)3... where do they end up? I need a hint...