The number on the both side of;have a relation between them.If pair of numbers on both side of;follow the same relation,then the number which replace the ??is 354;4;; 852;11;;794;12;;951 ; ?? Share with your friends Share 2 Shruti Tyagi answered this Dear Student, The abovee series havin following pattern3+5-4=48+5-2=117+9-4=129+5-1=13Hence ?? is replaced by 13 Regards, -1 View Full Answer