Use the fact that a group of order 30 has a subgroup of order 15 to show that there are precisely four isomorp?

Use the fact that a group of order 30 has a subgroup of order 15 to show that there are precisely four isomorphism classes of groups of order 30.
Update: Use the fact that a group of order 30 has a subgroup of order 15 to show that there
are precisely four isomorphism classes of groups of order 30.
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