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Group Theory PS03EMTH36 (13-04-2022)
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Group Theory PS03EMTH36 (13-04-2022)
Question 1.
The number of elements
x
∈
S
3
satisfying
x
2
=
e
is
.
i)
1
ii)
2
iii)
3
iv)
4
Choice i) is
Incorrect.
Check
e
2
,
φ
2
,
(
φ
ψ
)
2
, etc.
Choice ii) is
Incorrect.
Check
e
2
,
φ
2
,
(
φ
ψ
)
2
, etc.
Choice iii) is
Incorrect.
Check
e
2
,
φ
2
,
(
φ
ψ
)
2
, etc.
Choice iv) is
Correct!
Yes,
e
2
=
e
,
φ
2
=
e
,
(
φ
ψ
)
2
=
e
,
(
ψ
φ
)
2
=
e
, but
ψ
2
≠
e
and
(
ψ
2
)
2
=
ψ
≠
e
.
Question 2.
The order of
{
k
∈
ℕ
∣
k
<
9
,
gcd
(
k
,
9
)
=
1
}
under multiplication modulo
9
is
.
i)
1
ii)
6
iii)
8
iv)
9
Choice i) is
Incorrect.
Choice ii) is
Correct!
Choice iii) is
Incorrect.
Choice iv) is
Incorrect.
Question 3.
Let
G
be an abelian group and
T
:
G
→
G
be given by
T
(
x
)
=
x
−
1
. Then
T
is a non-trivial homomorphism if and only if
.
i)
x
2
≠
e
for all
x
∈
G
ii)
x
2
=
e
for some
x
∈
G
iii)
x
2
≠
e
for some
x
∈
G
iv)
x
2
=
e
for all
x
∈
G
Choice i) is
Incorrect.
Choice ii) is
Incorrect.
Choice iii) is
Correct!
Choice iv) is
Incorrect.
Question 4.
A group of order
need not be abelian
i)
9
ii)
2
5
iii)
3
6
iv)
4
9
Choice i) is
Incorrect.
Choice ii) is
Incorrect.
Choice iii) is
Correct!
Choice iv) is
Incorrect.
Question 5.
A group of order
2
0
2
2
does not have a
-Sylow subgroup.
i)
2
ii)
3
iii)
5
iv)
none of these
Choice i) is
Incorrect.
Choice ii) is
Incorrect.
Choice iii) is
Correct!
Choice iv) is
Incorrect.
Question 6.
The highest power of
2
dividing the binomial coefficient
1
6
0
1
6
is
.
i)
1
ii)
5
iii)
4
iv)
1
0
Choice i) is
Correct!
Choice ii) is
Incorrect.
Choice iii) is
Incorrect.
Choice iv) is
Incorrect.
Question 7.
If a group
G
is internal direct product of its subgroups
N
1
and
N
2
, then
.
i)
N
1
∩
N
2
=
(
e
)
ii)
N
1
=
N
2
iii)
G
≠
N
1
N
2
iv)
N
1
∪
N
2
=
(
e
)
Choice i) is
Correct!
Choice ii) is
Incorrect.
Choice iii) is
Incorrect.
Choice iv) is
Incorrect.
Question 8.
The number of invariants of a cyclic group of order
6
2
5
is
.
i)
1
ii)
4
iii)
5
iv)
2
5
Choice i) is
Correct!
Choice ii) is
Incorrect.
Choice iii) is
Incorrect.
Choice iv) is
Incorrect.