Q. At the confluence of which two rivers, the foundation of the city of Pataliputra was laid by the King Udayin?
Answer:
Ganga and Son
Notes: King Udayin was the ruler of Haryanka dynasty. He was the son of Ajatashatru and grandson of King Bimbisara. King Udayin ruled Magadha from 460 BCE to 440 BCE. He laid the foundation of the city of Pataliputra at the confluence of
two rivers, the Son and the Ganga. King Udayin was succeded by Anuruddha.