CAIRO (Reuters) - Syrian opposition will form a 50-member delegation to participate in U.N.-sponsored talks in Geneva, the main Syrian opposition meeting in the Saudi capital Riyadh told a news conference late on Thursday.   There will be further meetings tomorrow to decide the members of the delegation and determine its working mechanism,  Basma Qadmani, a member of the National Coalition for Syrian Revolutionary and Opposition Forces, said.  
Syrian opposition to form delegation to take part in U.N. talks