Exercise
Which of the following groups is normal in S
n
,
n
> 4?
S
n
- 1
<(1,2,3, ...,
n
)>
A
n
No.
No.
Yes.
Sn - 1
<(1,2,3, ..., n)>
An
Sn - 1
<(1,2,3, ..., n)>
An