(Corrects spelling for Singapore firm to Rodyk & Davidson, instead of Roydk & Davidson)
Nov 2 (Reuters) - International law firm Dentons says it is discussing mergers with 500-lawyer Australian firm Gadens and 200-lawyer Singaporean firm Rodyk & Davidson. The talks follow 3,000-lawyer Dentons' agreement earlier in the year to combine with China's Dacheng Law Offices, which will create the world's largest firm when the merger is completed.