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let G be a group and let H be a subgroup of G with |G : H | = 2. (we know that if H
let G be a group and let H be a subgroup of G
with |G : H | = 2.
(we know that if H is a subgroup of group G. Then (a) if H = {e} then |G: H | = | G | (b) if H = G then | G : H= 1 |
- If K is a subgroup of G with at least one element not in H, show that G = HK.
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