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This is TIFR 2013 Maths Paper Answer Key.

## These answers are unofficial. If you have an alternative answer, feel free to suggest it in the comment section.

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**Part A**

1. D

2. B

3. C

4. C

5. D

6. C

7. D

8. A

9. C

10. B

11. D

12. C

13. B

14. B

15. D

16. D

17. B

18. C

19. B

20. D

Let C denote the cube . How many rotations are there in which take C to itself?

A. 6; B. 12 C. 18. **D. 24**

**Discussion:**

Theorem: A finite subgroup of is one of the following groups:

- : the cyclic group of rotations by multiples of about a line, with k arbitrary
- : the Dihedral group of symmetries of a regular k-gon, with k arbitrary
- the tetrahedral group of 12 rotational symmetries of a tetrahedron;
- : the octahedral group of 24 rotational symmetries of a cube or an octahedron
- : the icosahedral group of 60 rotational symmetries of a dodecahedron or an icosahedron

**Part B**

21. C

22. A

23.

24. D

25. A

26. B

27. D

28. A

29. A

30. B

(courtesy: Tattwamasi Amrutam)

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