Group theory 30: Outer automorphisms

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This lecture is part of an online course on group theory. We find the automorphism groups of symmetric groups, and in particular show that the symmetric group on 6 points has "extra" (outer) automorphisms.
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Is it at all interesting to get a Schreier conjecture proof, which would be independent of classification?

Suav
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Sir again I asking you, so please tell or give some hints....
Automorphism of Dn is isomorphic to which group ??
(Here Dn is dihedral group).
I have only idea of its order.... Order of Aut(Dn) is n × phi(n).

The_Pi_Piper