Explanation:

• Contemporary accounts by Greek historians show that Chandragupta was a youth living in Taxila when Alexander invaded India.
• Greek historians have recorded his name as “Sandrakottus” or “Sandrakoptus”, which are evidently modified forms of Chandragupta.
• Inspired by Alexander, Chandragupta led a revolt against the Nandas years later and overthrew them.

Source: Tamil Nadu state board