Artuti E, Uminastuti, Pandiangan P, Hamdani M. STUDENTS ’ABILITY TO SOLVE RANDOM CHANGE PROBLEMS AND DISTRIBUTION OF OPPORTUNITIES IN THE ERA OF COVID-19. JPN [Internet]. 2021 Jun. 28 [cited 2024 Dec. 22];22(1):12-24. Available from: https://e-journal.upr.ac.id/index.php/JPN/article/view/2688