From among the following Mahajanapadas, identify the gana/sangha (oligarchy) :

Which one among the following mahajanapadas in ancient India was an oligarchy?

During the period of 16 Mahajanapadas, Mathura was the capital of –

Which was the first capital of ancient Mahajanapada Magadh?

Champa was the capital of which Mahajanapada?

Which of the following is not correctly matched?