Learning Activities in Mathematics Education: Application of Problem-Based Learning in Power Dominating Set for Electricity Network Optimization Problems Journal title: International Journal of Social Science And Human Research Authors: Indah Yuliana, Jesy Irwanto, Didik Sugeng Pambudi, Dafik, I Made Tirta Subject(s): Economics, Humanities, Law, Social Sciences, Literature, Sociology of Education, Criminology, Public Administration