a) Using Cayley’s theorem, find the permutation group to which a cyclic group of
order 12 is isomorphic. (4)
b) Let τ be a fixed odd permutation in .
S10 Show that every odd permutation in S is
10
a product of τ and some permutation in .
A10 (2)
c) List two distinct cosets of < r > in ,
D10 where r is a reflection in .
D10 (2)
d) Give the smallest n ∈ N for which An is non-abelian. Justify your answer.
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