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★right first attempt
✓right
✗wrong

Group Theory  PS03EMTH36 (13-04-2022)
Question 1. The number of elements x ∈ S3 satisfying x2 = e is     .
i)
1
ii)
2
iii)
3
iv)
4

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

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)
x2≠e for all x ∈ G
ii)
x2 = e for some x ∈ G
iii)
x2≠e for some x ∈ G
iv)
x2 = e for all x ∈ G

Question 4. A group of order     need not be abelian
i)
9
ii)
25
iii)
36
iv)
49

Question 5. A group of order 2022 does not have a     -Sylow subgroup.
i)
2
ii)
3
iii)
5
iv)
none of these

Question 6. The highest power of 2 dividing the binomial coefficient 160 16 is     .
i)
1
ii)
5
iii)
4
iv)
10

Question 7. If a group G is internal direct product of its subgroups N1 and N2, then     .
i)
N1 ∩ N2 = (e)
ii)
N1 = N2
iii)
G≠N1N2
iv)
N1 ∪ N2 = (e)

Question 8. The number of invariants of a cyclic group of order 625 is     .
i)
1
ii)
4
iii)
5
iv)
25