Matitaputty C, Nusantara T, Hidayanto E, Sukoriyanto. Examining the pedagogical content knowledge of in-service mathematics teachers on the permutations and combinations in the context of student mistakes. j. math. educ. [Internet]. 2022 Nov. 21 [cited 2024 Nov. 22];13(3):393-414. Available from: http://jme.ejournal.unsri.ac.id/index.php/jme/article/view/233