Q. With reference to ancient Indian mathematicians and astronomers, consider the following statements:

1. Aryabhata was the first to assert that the Earth rotates on its axis
2. Varahamihira is known for his work in astrology and mathematics
3. Brahmagupta introduced the concept of gravity
4. Bhaskara II is famous for his contributions to alchemy

Which of the above statements are correct?
Answer: Only two
Notes: Aryabhata was indeed the first to assert that the Earth rotates on its axis while Varahamihira is recognized for his work in astrology and mathematics. However, it was not Brahmagupta who introduced the concept of gravity, similarly, Bhaskara II is renowned for his work in mathematics and astronomy, not alchemy.