Because their mother said so. Arjuna won Draupadi in an archery/bravery competition. When he returned home with the prize, his mother (not knowing that the prize was a girl) …told the 5 brothers to share it equally. Thus, draupadi became the wife of all the 5 brothers (MORE)
No!First he was not a pandava ner the kaurava.And because Karna want to kill arjuna Bheema said no way!But Dhuryodhana was wild to hear Bheema and made Karna the King of anga.…So karna and Dhuryodhana had friendship.So Karna is a kaurava. (MORE)