Question: how many abelian groups are there of order 24?
Answer: 11.26 Up to isomorphism, there are 3 Abelian groups of order 24: ZZ8 × ZZ2 × ZZ3, ZZ2 × ZZ4 × ZZ3, and ZZ2 × ZZ2 × ZZ2 × ZZ3; there are 2 Abelian groups of order 25: ZZ25, ZZ5 × ZZ5.