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.
• Chandragupta achieved it either by inciting the people to rise against an unpopular monarch, or by soliciting their support in overthrowing an unpopular king.
• Chandragupta established the Mauryan Empire and became its first emperor in 321 BCE.

Source: Tamil Nadu Board Class 11